xref: /aosp_15_r20/external/ktfmt/core/src/test/java/com/facebook/ktfmt/format/FormatterTest.kt (revision 5be3f65c8cf0e6db0a7e312df5006e8e93cdf9ec)

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook.ktfmt.format

import com.facebook.ktfmt.format.Formatter.META_FORMAT
import com.facebook.ktfmt.testutil.assertFormatted
import com.facebook.ktfmt.testutil.assertThatFormatting
import com.facebook.ktfmt.testutil.defaultTestFormattingOptions
import com.google.common.truth.Truth.assertThat
import org.junit.Assert.fail
import org.junit.BeforeClass
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4

@Suppress("FunctionNaming")
@RunWith(JUnit4::class)
class FormatterTest {

  @Test
  fun `support script (kts) files`() =
      assertFormatted(
          """
        |package foo
        |
        |import java.io.File
        |
        |val one: String
        |
        |val two: String
        |
        |fun f() {
        |  println("asd")
        |}
        |
        |println("Called with args:")
        |
        |args.forEach { println(File + "-") }
        |"""
              .trimMargin())

  @Test
  fun `support script (kts) files with a shebang`() =
      assertFormatted(
          """
        |#!/usr/bin/env kscript
        |package foo
        |
        |println("Called")
        |"""
              .trimMargin())

  @Test
  fun `call chains`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |fun f() {
      |  // Static method calls are attached to the class name.
      |  ImmutableList.newBuilder()
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .build()
      |
      |  // Multiple call expressions --> each on its own line.
      |  ImmutableList()
      |      .newBuilder()
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .add(1)
      |      .build()
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `line breaks in function arguments`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |fun f() {
      |  computeBreaks(
      |      javaOutput.commentsHelper,
      |      maxWidth,
      |      Doc.State(+0, 0))
      |  computeBreaks(
      |      output.commentsHelper, maxWidth, State(0))
      |  doc.computeBreaks(
      |      javaOutput.commentsHelper,
      |      maxWidth,
      |      Doc.State(+0, 0))
      |  doc.computeBreaks(
      |      output.commentsHelper, maxWidth, State(0))
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `parameters and return type in function definitions`() =
      assertFormatted(
          """
      |////////////////////////////////////////
      |fun format(
      |    code: String,
      |    maxWidth: Int =
      |        DEFAULT_MAX_WIDTH_VERY_LONG
      |): String {
      |  val a = 0
      |}
      |
      |fun print(
      |    code: String,
      |    maxWidth: Int =
      |        DEFAULT_MAX_WIDTH_VERY_LONG
      |) {
      |  val a = 0
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `kitchen sink of tests`() {
    // Don't add more tests here
    val code =
        """
        |fun
        |f  (
        |a : Int
        | , b: Double , c:String) {           var result = 0
        | val aVeryLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongVar = 43
        |          foo.bar.zed.accept(
        |
        |          )
        |
        |          foo(
        |
        |          )
        |
        |          foo.bar.zed.accept(
        |                DoSomething.bar()
        |          )
        |
        |          bar(
        |          ImmutableList.newBuilder().add(1).add(1).add(1).add(1).add(1).add(1).add(1).add(1).add(1).add(1).build())
        |
        |
        |          ImmutableList.newBuilder().add(1).add(1).add(1).add(1).add(1).add(1).add(1).add(1).add(1).add(1).build()
        |     }
        |"""
            .trimMargin()

    val expected =
        """
        |fun f(a: Int, b: Double, c: String) {
        |  var result = 0
        |  val aVeryLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongVar =
        |      43
        |  foo.bar.zed.accept()
        |
        |  foo()
        |
        |  foo.bar.zed.accept(DoSomething.bar())
        |
        |  bar(
        |      ImmutableList.newBuilder()
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .add(1)
        |          .build())
        |
        |  ImmutableList.newBuilder()
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .add(1)
        |      .build()
        |}
        |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
    // Don't add more tests here
  }

  @Test
  fun `spacing around variable declarations`() =
      assertFormatted(
          """
      |fun f() {
      |  var x: Int = 4
      |  val y = 0
      |}
      |"""
              .trimMargin())

  @Test fun `class without a body nor properties`() = assertFormatted("class Foo\n")

  @Test fun `interface without a body nor properties`() = assertFormatted("interface Foo\n")

  @Test fun `preserve empty primary constructor`() = assertFormatted("class Foo()\n")

  @Test
  fun `simple fun interface`() =
      assertFormatted(
          """fun interface MyRunnable {
        |  fun runIt()
        |}
        |"""
              .trimMargin())

  @Test
  fun `handle complex fun interface without body`() =
      assertFormatted("public fun interface Function<T : List<*>> : (Int, T?) -> T?\n")

  @Test
  fun `class without a body, with explicit ctor params`() =
      assertFormatted("class Foo(a: Int, var b: Double, val c: String)\n")

  @Test
  fun `class with a body and explicit ctor params`() =
      assertFormatted(
          """
      |class Foo(a: Int, var b: Double, val c: String) {
      |  val x = 2
      |
      |  fun method() {}
      |
      |  class Bar
      |}
      |"""
              .trimMargin())

  @Test
  fun `properties and fields with modifiers`() =
      assertFormatted(
          """
      |class Foo(public val p1: Int, private val p2: Int, open val p3: Int, final val p4: Int) {
      |  private var f1 = 0
      |
      |  public var f2 = 0
      |
      |  open var f3 = 0
      |
      |  final var f4 = 0
      |}
      |"""
              .trimMargin())

  @Test
  fun `properties with multiple modifiers`() =
      assertFormatted(
          """
      |class Foo(public open inner val p1: Int) {
      |  public open inner var f2 = 0
      |}
      |"""
              .trimMargin())

  @Test
  fun `spaces around binary operations`() =
      assertFormatted(
          """
      |fun foo() {
      |  a = 5
      |  x + 1
      |}
      |"""
              .trimMargin())

  @Test
  fun `breaking long binary operations`() =
      assertFormatted(
          """
      |////////////////////
      |fun foo() {
      |  val finalWidth =
      |      value1 +
      |          value2 +
      |          (value3 +
      |              value4 +
      |              value5) +
      |          foo(v) +
      |          (1 + 2) +
      |          function(
      |              value7,
      |              value8) +
      |          value9
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `prioritize according to associativity`() =
      assertFormatted(
          """
      |//////////////////////////////////////
      |fun foo() {
      |  return expression1 != expression2 ||
      |      expression2 != expression1
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `once a binary expression is broken, split on every line`() =
      assertFormatted(
          """
        |//////////////////////////////////////
        |fun foo() {
        |  val sentence =
        |      "The" +
        |          "quick" +
        |          ("brown" + "fox") +
        |          "jumps" +
        |          "over" +
        |          "the" +
        |          "lazy" +
        |          "dog"
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `long binary expressions with ranges in the middle`() =
      assertFormatted(
          """
        |//////////////////////////////////////
        |fun foo() {
        |  val sentence =
        |      "The" +
        |          "quick" +
        |          ("brown".."fox") +
        |          ("brown"..<"fox") +
        |          "jumps" +
        |          "over" +
        |          "the".."lazy" + "dog"
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `assignment expressions with scoping functions are block-like`() =
      assertFormatted(
          """
        |///////////////////////////
        |fun f() {
        |  name.sub = scope { x ->
        |    //
        |  }
        |  name.sub += scope { x ->
        |    //
        |  }
        |  name.sub -= scope { x ->
        |    //
        |  }
        |  name.sub *= scope { x ->
        |    //
        |  }
        |  name.sub /= scope { x ->
        |    //
        |  }
        |  name.sub %= scope { x ->
        |    //
        |  }
        |}
        |
        |fun h() {
        |  long.name.sub =
        |      scope { x ->
        |        //
        |      }
        |  long.name.sub +=
        |      scope { x ->
        |        //
        |      }
        |  long.name.sub -=
        |      scope { x ->
        |        //
        |      }
        |  long.name.sub *=
        |      scope { x ->
        |        //
        |      }
        |  long.name.sub /=
        |      scope { x ->
        |        //
        |      }
        |  long.name.sub %=
        |      scope { x ->
        |        //
        |      }
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `don't keep adding newlines between these two comments when they're at end of file`() {
    assertFormatted(
        """
     |package foo
     |// a
     |
     |/* Another comment */
     |"""
            .trimMargin())

    assertFormatted(
        """
     |// Comment as first element
     |package foo
     |// a
     |
     |/* Another comment */
     |"""
            .trimMargin())

    assertFormatted(
        """
     |// Comment as first element then blank line
     |
     |package foo
     |// a
     |
     |/* Another comment */
     |"""
            .trimMargin())

    assertFormatted(
        """
     |// Comment as first element
     |package foo
     |// Adjacent line comments
     |// Don't separate
     |"""
            .trimMargin())
  }

  @Test
  fun `properties with line comment above initializer`() =
      assertFormatted(
          """
      |class Foo {
      |  var x: Int =
      |      // Comment
      |      0
      |
      |  var y: Int =
      |      // Comment
      |      scope {
      |        0 //
      |      }
      |
      |  var z: Int =
      |      // Comment
      |      if (cond) {
      |        0
      |      } else {
      |        1
      |      }
      |}
      |"""
              .trimMargin())

  @Test
  fun `properties with line comment above delegate`() =
      assertFormatted(
          """
      |class Foo {
      |  var x: Int by
      |      // Comment
      |      0
      |
      |  var y: Int by
      |      // Comment
      |      scope {
      |        0 //
      |      }
      |
      |  var z: Int by
      |      // Comment
      |      if (cond) {
      |        0
      |      } else {
      |        1
      |      }
      |}
      |"""
              .trimMargin())

  @Test
  fun `properties with accessors`() =
      assertFormatted(
          """
      |class Foo {
      |  var x: Int
      |    get() = field
      |
      |  var y: Boolean
      |    get() = x.equals(123)
      |    set(value) {
      |      field = value
      |    }
      |
      |  var z: Boolean
      |    get() {
      |      x.equals(123)
      |    }
      |
      |  var zz = false
      |    private set
      |}
      |"""
              .trimMargin())

  @Test
  fun `properties with accessors and semicolons on same line`() {
    val code =
        """
      |class Foo {
      |  var x = false; private set
      |
      |  internal val a by lazy { 5 }; internal get
      |
      |  var foo: Int; get() = 6; set(x) {};
      |}
      |"""
            .trimMargin()

    val expected =
        """
      |class Foo {
      |  var x = false
      |    private set
      |
      |  internal val a by lazy { 5 }
      |    internal get
      |
      |  var foo: Int
      |    get() = 6
      |    set(x) {}
      |}
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `a property with a too long name being broken on multiple lines`() =
      assertFormatted(
          """
      |////////////////////
      |class Foo {
      |  val thisIsALongName:
      |      String =
      |      "Hello there this is long"
      |    get() = field
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `multi-character unary and binary operators such as ==`() =
      assertFormatted(
          """
      |fun f() {
      |  3 == 4
      |  true && false
      |  a++
      |  a === b
      |}
      |"""
              .trimMargin())

  @Test
  fun `package names stay in one line`() {
    val code =
        """
      | package  com  .example. subexample
      |
      |fun f() = 1
      |"""
            .trimMargin()
    val expected =
        """
      |package com.example.subexample
      |
      |fun f() = 1
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `handle package name and imports with escapes and spaces`() =
      assertFormatted(
          """
      |package com.`fun times`.`with package names`
      |
      |import `nothing stops`.`us`.`from doing this`
      |
      |fun f() = `from doing this`()
      |"""
              .trimMargin())

  @Test
  fun `safe dot operator expression`() =
      assertFormatted(
          """
      |fun f() {
      |  node?.name
      |}
      |"""
              .trimMargin())

  @Test
  fun `safe dot operator expression with normal`() =
      assertFormatted(
          """
      |fun f() {
      |  node?.name.hello
      |}
      |"""
              .trimMargin())

  @Test
  fun `safe dot operator expression chain in expression function`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |fun f(number: Int) =
      |    Something.doStuff(number)?.size
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `avoid breaking suspected package names`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  com.facebook.Foo
      |      .format()
      |  org.facebook.Foo
      |      .format()
      |  java.lang.stuff.Foo
      |      .format()
      |  javax.lang.stuff.Foo
      |      .format()
      |  kotlin.lang.Foo
      |      .format()
      |  foo.facebook.Foo
      |      .format()
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `an assortment of tests for emitQualifiedExpression`() =
      assertFormatted(
          """
      |/////////////////////////////////////
      |fun f() {
      |  // Regression test: https://github.com/facebook/ktfmt/issues/56
      |  kjsdfglkjdfgkjdfkgjhkerjghkdfj
      |      ?.methodName1()
      |
      |  // a series of field accesses followed by a single call expression
      |  // is kept together.
      |  abcdefghijkl.abcdefghijkl
      |      ?.methodName2()
      |
      |  // Similar to above.
      |  abcdefghijkl.abcdefghijkl
      |      ?.methodName3
      |      ?.abcdefghijkl()
      |
      |  // Multiple call expressions cause each part of the expression
      |  // to be placed on its own line.
      |  abcdefghijkl
      |      ?.abcdefghijkl
      |      ?.methodName4()
      |      ?.abcdefghijkl()
      |
      |  // Don't break first call expression if it fits.
      |  foIt(something.something.happens())
      |      .thenReturn(result)
      |
      |  // Break after `longerThanFour(` because it's longer than 4 chars
      |  longerThanFour(
      |          something.something
      |              .happens())
      |      .thenReturn(result)
      |
      |  // Similarly to above, when part of qualified expression.
      |  foo.longerThanFour(
      |          something.something
      |              .happens())
      |      .thenReturn(result)
      |
      |  // Keep 'super' attached to the method name
      |  super.abcdefghijkl
      |      .methodName4()
      |      .abcdefghijkl()
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `an assortment of tests for emitQualifiedExpression with lambdas`() =
      assertFormatted(
          """
      |////////////////////////////////////////////////////////////////////////////
      |fun f() {
      |  val items =
      |      items.toMutableList.apply {
      |        //
      |        foo
      |      }
      |
      |  val items =
      |      items.toMutableList().apply {
      |        //
      |        foo
      |      }
      |
      |  // All dereferences are on one line (because they fit), even though
      |  // the apply() at the end requires a line break.
      |  val items =
      |      items.toMutableList.sdfkjsdf.sdfjksdflk.sdlfkjsldfj.apply {
      |        //
      |        foo
      |      }
      |
      |  // All method calls are on one line (because they fit), even though
      |  // the apply() at the end requires a line break.
      |  val items =
      |      items.toMutableList().sdfkjsdf().sdfjksdflk().sdlfkjsldfj().apply {
      |        //
      |        foo
      |      }
      |
      |  // All method calls with lambdas could fit, but we avoid a block like syntax
      |  // and break to one call per line
      |  val items =
      |      items
      |          .map { it + 1 }
      |          .filter { it > 0 }
      |          .apply {
      |            //
      |            foo
      |          }
      |
      |  // the lambda is indented properly with the break before it
      |  val items =
      |      items.fieldName.sdfkjsdf.sdfjksdflk.sdlfkjsldfj.sdfjksdflk.sdlfkjsldfj
      |          .sdlfkjsldfj
      |          .apply {
      |            //
      |            foo
      |          }
      |  items.fieldName.sdfkjsdf.sdfjksdflk.sdlfkjsldfj.sdfjksdflk.sdlfkjsldfj
      |      .apply {
      |        //
      |        foo
      |      }
      |
      |  // When there are multiple method calls, and they don't fit on one
      |  // line, put each on a new line.
      |  val items =
      |      items
      |          .toMutableList()
      |          .sdfkjsdf()
      |          .sdfjksdflk()
      |          .sdlfkjsldfj()
      |          .sdfjksdflk()
      |          .sdlfkjsldfj()
      |          .apply {
      |            //
      |            foo
      |          }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `when two lambdas are in a chain, avoid block syntax`() =
      assertFormatted(
          """
      |class Foo : Bar() {
      |  fun doIt() {
      |    fruit.onlyBananas().forEach { banana ->
      |      val seeds = banana.find { it.type == SEED }
      |      println(seeds)
      |    }
      |
      |    fruit
      |        .filter { isBanana(it, Bananas.types) }
      |        .forEach { banana ->
      |          val seeds = banana.find { it.type == SEED }
      |          println(seeds)
      |        }
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `don't one-line lambdas following argument breaks`() =
      assertFormatted(
          """
      |////////////////////////////////////////////////////////////////////////
      |class Foo : Bar() {
      |  fun doIt() {
      |    // don't break in lambda, no argument breaks found
      |    fruit.forEach { eat(it) }
      |
      |    // break in the lambda, without comma
      |    fruit.forEach(
      |        someVeryLongParameterNameThatWillCauseABreak,
      |        evenWithoutATrailingCommaOnTheParameterListSoLetsSeeIt) {
      |          eat(it)
      |        }
      |
      |    // break in the lambda, with comma
      |    fruit.forEach(
      |        fromTheVine = true,
      |    ) {
      |      eat(it)
      |    }
      |
      |    // don't break in the inner lambda, as nesting doesn't respect outer levels
      |    fruit.forEach(
      |        fromTheVine = true,
      |    ) {
      |      fruit.forEach { eat(it) }
      |    }
      |
      |    // don't break in the lambda, as breaks don't propagate
      |    fruit
      |        .onlyBananas(
      |            fromTheVine = true,
      |        )
      |        .forEach { eat(it) }
      |
      |    // don't break in the inner lambda, as breaks don't propagate to parameters
      |    fruit.onlyBananas(
      |        fromTheVine = true,
      |        processThem = { eat(it) },
      |    ) {
      |      eat(it)
      |    }
      |
      |    // don't break in the inner lambda, as breaks don't propagate to the body
      |    fruit.onlyBananas(
      |        fromTheVine = true,
      |    ) {
      |      val anon = { eat(it) }
      |    }
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `indent parameters after a break when there's a lambda afterwards`() =
      assertFormatted(
          """
      |///////////////////////////
      |class C {
      |  fun method() {
      |    Foo.FooBar(
      |            param1, param2)
      |        .apply {
      |          //
      |          foo
      |        }
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `no forward propagation of breaks in call expressions (at trailing lambda)`() =
      assertFormatted(
          """
      |//////////////////////////
      |fun test() {
      |  foo_bar_baz__zip<A>(b) {
      |    c
      |  }
      |  foo.bar(baz).zip<A>(b) {
      |    c
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `forward propagation of breaks in call expressions (at value args)`() =
      assertFormatted(
          """
      |//////////////////////
      |fun test() {
      |  foo_bar_baz__zip<A>(
      |      b) {
      |        c
      |      }
      |}
      |
      |fun test() {
      |  foo.bar(baz).zip<A>(
      |      b) {
      |        c
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `forward propagation of breaks in call expressions (at type args)`() =
      assertFormatted(
          """
      |///////////////////
      |fun test() {
      |  foo_bar_baz__zip<
      |      A>(
      |      b) {
      |        c
      |      }
      |  foo.bar(baz).zip<
      |      A>(
      |      b) {
      |        c
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `expected indent in methods following single-line strings`() =
      assertFormatted(
          """
      |/////////////////////////
      |"Hello %s"
      |    .format(expression)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `forced break between multi-line strings and their selectors`() =
      assertFormatted(
          """
      |/////////////////////////
      |val STRING =
      |    $TQ
      |    |foo
      |    |$TQ
      |        .wouldFit()
      |
      |val STRING =
      |    $TQ
      |    |foo
      |    |//////////////////////////////////$TQ
      |        .wouldntFit()
      |
      |val STRING =
      |    $TQ
      |    |foo
      |    |$TQ
      |        .firstLink()
      |        .secondLink()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `import list`() {
    val code =
        """
      | import  com .example.common.reality. FooBar
      |  import  com .example.common.reality. FooBar2  as  foosBars
      |   import com .example.common.reality. *
      | import  foo.bar // Test
      |  import  abc.def /*
      |                  test */
      |
      |val x = FooBar.def { foosBars(bar) }
      |"""
            .trimMargin()
    val expected =
        """
      |import abc.def /*
      |               test */
      |import com.example.common.reality.*
      |import com.example.common.reality.FooBar
      |import com.example.common.reality.FooBar2 as foosBars
      |import foo.bar // Test
      |
      |val x = FooBar.def { foosBars(bar) }
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `imports with trailing comments and expressions`() {
    val code =
        """
        |import com.example.zab // test
        |import com.example.foo ; val x = Sample(foo, zab)
        |"""
            .trimMargin()

    val expected =
        """
        |import com.example.foo
        |import com.example.zab // test
        |
        |val x = Sample(foo, zab)
        |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `backticks are ignored in import sort order`() =
      assertFormatted(
          """
      |import com.example.`if`
      |import com.example.we
      |import com.example.`when`
      |import com.example.wow
      |
      |val x = `if` { we.`when`(wow) }
      |"""
              .trimMargin())

  @Test
  fun `backticks are ignored in import sort order ('as' directory)`() =
      assertFormatted(
          """
      |import com.example.a as `if`
      |import com.example.a as we
      |import com.example.a as `when`
      |import com.example.a as wow
      |
      |val x = `if` { we.`when`(wow) }
      |"""
              .trimMargin())

  @Test
  fun `imports are deduplicated`() {
    val code =
        """
      |import com.example.b.*
      |import com.example.b
      |import com.example.a as `if`
      |import com.example.a as we
      |import com.example.a as `when`
      |import com.example.a as wow
      |import com.example.a as `when`
      |
      |val x = `if` { we.`when`(wow) } ?: b
      |"""
            .trimMargin()
    val expected =
        """
      |import com.example.a as `if`
      |import com.example.a as we
      |import com.example.a as `when`
      |import com.example.a as wow
      |import com.example.b
      |import com.example.b.*
      |
      |val x = `if` { we.`when`(wow) } ?: b
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `unused imports are removed`() {
    val code =
        """
      |import com.unused.Sample
      |import com.used.FooBarBaz as Baz
      |import com.used.bar // test
      |import com.used.`class`
      |import com.used.a.*
      |import com.used.b as `if`
      |import com.used.b as we
      |import com.unused.a as `when`
      |import com.unused.a as wow
      |
      |fun test(input: we) {
      |  Baz(`class`)
      |  `if` { bar }
      |  val x = unused()
      |}
      |"""
            .trimMargin()
    val expected =
        """
      |import com.used.FooBarBaz as Baz
      |import com.used.a.*
      |import com.used.b as `if`
      |import com.used.b as we
      |import com.used.bar // test
      |import com.used.`class`
      |
      |fun test(input: we) {
      |  Baz(`class`)
      |  `if` { bar }
      |  val x = unused()
      |}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `used imports from this package are removed`() {
    val code =
        """
            |package com.example
            |
            |import com.example.Sample
            |import com.example.Sample.CONSTANT
            |import com.example.a.foo
            |
            |fun test() {
            |  foo(CONSTANT, Sample())
            |}
            |"""
            .trimMargin()
    val expected =
        """
            |package com.example
            |
            |import com.example.Sample.CONSTANT
            |import com.example.a.foo
            |
            |fun test() {
            |  foo(CONSTANT, Sample())
            |}
            |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `potentially unused imports from this package are kept if they are overloaded`() {
    val code =
        """
            |package com.example
            |
            |import com.example.a
            |import com.example.b
            |import com.example.c
            |import com.notexample.a
            |import com.notexample.b
            |import com.notexample.notC as c
            |
            |fun test() {
            |  a("hello")
            |  c("hello")
            |}
            |"""
            .trimMargin()
    val expected =
        """
            |package com.example
            |
            |import com.example.a
            |import com.example.c
            |import com.notexample.a
            |import com.notexample.notC as c
            |
            |fun test() {
            |  a("hello")
            |  c("hello")
            |}
            |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `used imports from this package are kept if they are aliased`() {
    val code =
        """
            |package com.example
            |
            |import com.example.b as a
            |import com.example.c
            |
            |fun test() {
            |  a("hello")
            |}
            |"""
            .trimMargin()
    val expected =
        """
            |package com.example
            |
            |import com.example.b as a
            |
            |fun test() {
            |  a("hello")
            |}
            |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `unused imports are computed using only the alias name if present`() {
    val code =
        """
            |package com.example
            |
            |import com.notexample.a as b
            |
            |fun test() {
            |  a("hello")
            |}
            |"""
            .trimMargin()
    val expected =
        """
            |package com.example
            |
            |fun test() {
            |  a("hello")
            |}
            |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `keep import elements only mentioned in kdoc`() {
    val code =
        """
            |package com.example.kdoc
            |
            |import com.example.Bar
            |import com.example.Example
            |import com.example.Foo
            |import com.example.JavaDocLink
            |import com.example.Param
            |import com.example.R
            |import com.example.ReturnedValue
            |import com.example.Sample
            |import com.example.unused
            |import com.example.exception.AnException
            |import com.example.kdoc.Doc
            |
            |/**
            | * [Foo] is something only mentioned here, just like [R.layout.test] and [Doc].
            | *
            | * Old {@link JavaDocLink} that gets removed.
            | *
            | * @throws AnException
            | * @exception Sample.SampleException
            | * @param unused [Param]
            | * @property JavaDocLink [Param]
            | * @return [Unit] as [ReturnedValue]
            | * @sample Example
            | * @see Bar for more info
            | * @throws AnException
            | */
            |class Dummy
            |"""
            .trimMargin()
    val expected =
        """
            |package com.example.kdoc
            |
            |import com.example.Bar
            |import com.example.Example
            |import com.example.Foo
            |import com.example.Param
            |import com.example.R
            |import com.example.ReturnedValue
            |import com.example.Sample
            |import com.example.exception.AnException
            |
            |/**
            | * [Foo] is something only mentioned here, just like [R.layout.test] and [Doc].
            | *
            | * Old {@link JavaDocLink} that gets removed.
            | *
            | * @param unused [Param]
            | * @property JavaDocLink [Param]
            | * @return [Unit] as [ReturnedValue]
            | * @throws AnException
            | * @throws AnException
            | * @exception Sample.SampleException
            | * @sample Example
            | * @see Bar for more info
            | */
            |class Dummy
            |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `keep import elements only mentioned in kdoc, single line`() {
    assertFormatted(
        """
            |import com.shopping.Bag
            |
            |/**
            | * Some summary.
            | *
            | * @param count you can fit this many in a [Bag]
            | */
            |fun fetchBananas(count: Int)
            |"""
            .trimMargin())
  }

  @Test
  fun `keep import elements only mentioned in kdoc, multiline`() {
    assertFormatted(
        """
            |import com.shopping.Bag
            |
            |/**
            | * Some summary.
            | *
            | * @param count this is how many of these wonderful fruit you can fit into the useful object that
            | *   you may refer to as a [Bag]
            | */
            |fun fetchBananas(count: Int)
            |"""
            .trimMargin())
  }

  @Test
  fun `keep component imports`() =
      assertFormatted(
          """
              |import com.example.component1
              |import com.example.component10
              |import com.example.component120
              |import com.example.component2
              |import com.example.component3
              |import com.example.component4
              |import com.example.component5
              |"""
              .trimMargin())

  @Test
  fun `keep operator imports`() =
      assertFormatted(
          """
              |import com.example.and
              |import com.example.compareTo
              |import com.example.contains
              |import com.example.dec
              |import com.example.div
              |import com.example.divAssign
              |import com.example.equals
              |import com.example.get
              |import com.example.getValue
              |import com.example.hasNext
              |import com.example.inc
              |import com.example.invoke
              |import com.example.iterator
              |import com.example.minus
              |import com.example.minusAssign
              |import com.example.mod
              |import com.example.modAssign
              |import com.example.next
              |import com.example.not
              |import com.example.or
              |import com.example.plus
              |import com.example.plusAssign
              |import com.example.provideDelegate
              |import com.example.rangeTo
              |import com.example.rem
              |import com.example.remAssign
              |import com.example.set
              |import com.example.setValue
              |import com.example.times
              |import com.example.timesAssign
              |import com.example.unaryMinus
              |import com.example.unaryPlus
              |import org.gradle.kotlin.dsl.assign
              |"""
              .trimMargin())

  @Test
  fun `keep unused imports when formatting options has feature turned off`() {
    val code =
        """
            |import com.unused.FooBarBaz as Baz
            |import com.unused.Sample
            |import com.unused.a as `when`
            |import com.unused.a as wow
            |import com.unused.a.*
            |import com.unused.b as `if`
            |import com.unused.b as we
            |import com.unused.bar // test
            |import com.unused.`class`
            |"""
            .trimMargin()

    assertThatFormatting(code)
        .withOptions(defaultTestFormattingOptions.copy(removeUnusedImports = false))
        .isEqualTo(code)
  }

  @Test
  fun `comments between imports are moved above import list`() {
    val code =
        """
            |package com.facebook.ktfmt
            |
            |/* leading comment */
            |import com.example.abc
            |/* internal comment 1 */
            |import com.example.bcd
            |// internal comment 2
            |import com.example.Sample
            |// trailing comment
            |
            |val x = Sample(abc, bcd)
            |"""
            .trimMargin()
    val expected =
        """
            |package com.facebook.ktfmt
            |
            |/* leading comment */
            |/* internal comment 1 */
            |// internal comment 2
            |import com.example.Sample
            |import com.example.abc
            |import com.example.bcd
            |
            |// trailing comment
            |
            |val x = Sample(abc, bcd)
            |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `no redundant newlines when there are no imports`() =
      assertFormatted(
          """
              |package foo123
              |
              |/*
              |bar
              |*/
              |"""
              .trimMargin())

  @Test
  fun `basic annotations`() =
      assertFormatted(
          """
      |@Fancy
      |class Foo {
      |  @Fancy
      |  fun baz(@Fancy foo: Int) {
      |    @Fancy val a = 1 + foo
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `function calls with multiple arguments`() =
      assertFormatted(
          """
      |fun f() {
      |  foo(1, 2, 3)
      |
      |  foo(
      |      123456789012345678901234567890,
      |      123456789012345678901234567890,
      |      123456789012345678901234567890)
      |}
      |"""
              .trimMargin())

  @Test
  fun `function calls with multiple named arguments`() =
      assertFormatted(
          """
      |fun f() {
      |  foo(1, b = 2, c = 3)
      |
      |  foo(
      |      123456789012345678901234567890,
      |      b = 23456789012345678901234567890,
      |      c = 3456789012345678901234567890)
      |}
      |"""
              .trimMargin())

  @Test
  fun `named arguments indent their value expression`() =
      assertFormatted(
          """
      |fun f() =
      |    Bar(
      |        tokens =
      |            mutableListOf<Token>().apply {
      |              // Printing
      |              print()
      |            },
      |        duration = duration)
      |"""
              .trimMargin())

  @Test
  fun `Trailing comma forces variable value in list onto new line with manageTrailingCommas turned off`() =
      assertFormatted(
          """
            val aVar =
                setOf(
                    Env.Dev,
                    Env.Prod,
                )
            val aVar = setOf(Env.Dev, Env.Prod)

            """
              .trimIndent(),
          deduceMaxWidth = false,
      )

  @Test
  fun `nested functions, maps, and statements in named parameters - default`() =
      assertFormatted(
          """
            |////////////////////////////////////////////////////////////////////
            |function(
            |    param =
            |        (rate downTo min step step).drop(1).map {
            |          nestedFun(
            |              rate =
            |                  rate(
            |                      value =
            |                          firstArg<Input>().info.get(0).rate.value))
            |        })
            |"""
              .trimMargin(),
          deduceMaxWidth = true,
      )

  @Test
  fun `nested functions, maps, and statements in named parameters kotlin lang formats differently than default`() =
      assertFormatted(
          """
            |/////////////////////////////////////////////////////////////////////
            |function(
            |    param =
            |        (rate downTo min step step).drop(1).map {
            |            nestedFun(
            |                rate =
            |                    rate(
            |                        value =
            |                            firstArg<Input>().info.get(0).rate.value
            |                    )
            |            )
            |        }
            |)
            |"""
              .trimMargin(),
          formattingOptions = Formatter.KOTLINLANG_FORMAT,
          deduceMaxWidth = true,
      )

  @Test
  fun `complex calls and calculation in named parameters without wrapping`() =
      assertFormatted(
          """
            calculateMath(
                r = apr.sc(10) / BigDecimal(100) / BigDecimal(12),
                n = 12 * term,
                numerator = ((BigDecimal.ONE + r).pow(n)) - BigDecimal.ONE,
                denominator = r * (BigDecimal.ONE + r).pow(n),
            )

            """
              .trimIndent(),
          deduceMaxWidth = false,
      )

  @Test
  fun `Arguments are blocks`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |override fun visitProperty(property: KtProperty) {
      |  builder.sync(property)
      |  builder.block(ZERO) {
      |    declareOne(
      |        kind = DeclarationKind.FIELD,
      |        modifiers = property.modifierList,
      |        valOrVarKeyword =
      |            property.valOrVarKeyword.text,
      |        typeParameters =
      |            property.typeParameterList,
      |        receiver = property.receiverTypeReference,
      |        name = property.nameIdentifier?.text,
      |        type = property.typeReference,
      |        typeConstraintList =
      |            property.typeConstraintList,
      |        delegate = property.delegate,
      |        initializer = property.initializer)
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `anonymous function`() =
      assertFormatted(
          """
      |fun f() {
      |  setListener(
      |      fun(number: Int) {
      |        println(number)
      |      })
      |}
      |"""
              .trimMargin())

  @Test
  fun `anonymous function with receiver`() =
      assertFormatted(
          """
      |fun f() {
      |  setListener(
      |      fun View.() {
      |        println(this)
      |      })
      |}
      |"""
              .trimMargin())

  @Test
  fun `newlines between clauses of when() are preserved`() {
    assertThatFormatting(
            """
        |fun f(x: Int) {
        |  when (x) {
        |
        |
        |    1 -> print(1)
        |    2 -> print(2)
        |
        |
        |    3 ->
        |        // Comment
        |        print(3)
        |
        |    else -> {
        |      print("else")
        |    }
        |
        |  }
        |}
        |"""
                .trimMargin())
        .isEqualTo(
            """
        |fun f(x: Int) {
        |  when (x) {
        |    1 -> print(1)
        |    2 -> print(2)
        |
        |    3 ->
        |        // Comment
        |        print(3)
        |
        |    else -> {
        |      print("else")
        |    }
        |  }
        |}
        |"""
                .trimMargin())
  }

  @Test
  fun `when() with a subject expression`() =
      assertFormatted(
          """
      |fun f(x: Int) {
      |  when (x) {
      |    1 -> print(1)
      |    2 -> print(2)
      |    3 ->
      |        // Comment
      |        print(3)
      |    else -> {
      |      print("else")
      |    }
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression with complex predicates`() =
      assertFormatted(
          """
      |fun f(x: Int) {
      |  when {
      |    x == 1 || x == 2 -> print(1)
      |    x == 3 && x != 4 -> print(2)
      |    else -> {
      |      print(3)
      |    }
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression with several conditions`() =
      assertFormatted(
          """
      |fun f(x: Int) {
      |  when {
      |    0,
      |    1 -> print(1)
      |    else -> print(0)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression with is and in`() =
      assertFormatted(
          """
      |fun f(x: Int) {
      |  when (x) {
      |    is String -> print(1)
      |    !is String -> print(2)
      |    in 1..3 -> print()
      |    in a..b -> print()
      |    in a..3 -> print()
      |    in 1..b -> print()
      |    !in 1..b -> print()
      |    in 1..<b -> print()
      |    else -> print(3)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression with enum values`() =
      assertFormatted(
          """
      |fun f(x: Color) {
      |  when (x) {
      |    is Color.Red -> print(1)
      |    is Color.Green -> print(2)
      |    else -> print(3)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression with generic matcher and exhaustive`() =
      assertFormatted(
          """
      |fun f(x: Result) {
      |  when (x) {
      |    is Success<*> -> print(1)
      |    is Failure -> print(2)
      |  }.exhaustive
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression with multiline condition`() =
      assertFormatted(
          """
      |//////////////////////////
      |fun foo() {
      |  when (expressions1 +
      |      expression2 +
      |      expression3) {
      |    1 -> print(1)
      |    2 -> print(2)
      |  }
      |
      |  when (foo(
      |      expressions1 &&
      |          expression2 &&
      |          expression3)) {
      |    1 -> print(1)
      |    2 -> print(2)
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `lambda assigned to variable does not break before brace`() =
      assertFormatted(
          """
      |fun doIt() {
      |  val lambda = {
      |    doItOnce()
      |    doItTwice()
      |  }
      |}
      |
      |fun foo() = {
      |  doItOnce()
      |  doItTwice()
      |}
      |"""
              .trimMargin())

  @Test
  fun `when() expression storing in local variable`() =
      assertFormatted(
          """
      |fun f(x: Result) {
      |  when (val y = x.improved()) {
      |    is Success<*> -> print(y)
      |    is Failure -> print(2)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `line breaks inside when expressions and conditions`() =
      assertFormatted(
          """
      |fun f() {
      |  return Text.create(c)
      |      .onTouch {
      |        when (it.motionEvent.action) {
      |          ACTION_DOWN ->
      |              Toast.makeText(it.view.context, "Down!", Toast.LENGTH_SHORT, blablabla).show()
      |          ACTION_UP -> Toast.makeText(it.view.context, "Up!", Toast.LENGTH_SHORT).show()
      |          ACTION_DOWN ->
      |              Toast.makeText(
      |                      it.view.context, "Down!", Toast.LENGTH_SHORT, blablabla, blablabl, blabla)
      |                  .show()
      |        }
      |      }
      |      .build()
      |}
      |"""
              .trimMargin())

  @Test
  fun `function return types`() =
      assertFormatted(
          """
      |fun f1(): Int = 0
      |
      |fun f2(): Int {}
      |"""
              .trimMargin())

  @Test
  fun `multi line function without a block body`() =
      assertFormatted(
          """
      |/////////////////////////
      |fun longFunctionNoBlock():
      |    Int =
      |    1234567 + 1234567
      |
      |fun shortFun(): Int =
      |    1234567 + 1234567
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `return type doesn't fit in one line`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |interface X {
      |  fun f(
      |      arg1: Arg1Type,
      |      arg2: Arg2Type
      |  ): Map<String, Map<String, Double>>? {
      |    //
      |  }
      |
      |  fun functionWithGenericReturnType(
      |      arg1: Arg1Type,
      |      arg2: Arg2Type
      |  ): Map<String, Map<String, Double>>? {
      |    //
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `list of superclasses`() =
      assertFormatted(
          """
      |class Derived2 : Super1, Super2 {}
      |
      |class Derived1 : Super1, Super2
      |
      |class Derived3(a: Int) : Super1(a)
      |
      |class Derived4 : Super1()
      |
      |class Derived5 : Super3<Int>()
      |"""
              .trimMargin())

  @Test
  fun `list of superclasses over multiple lines`() =
      assertFormatted(
          """
      |////////////////////
      |class Derived2 :
      |    Super1,
      |    Super2 {}
      |
      |class Derived1 :
      |    Super1, Super2
      |
      |class Derived3(
      |    a: Int
      |) : Super1(a)
      |
      |class Derived4 :
      |    Super1()
      |
      |class Derived5 :
      |    Super3<Int>()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `annotations with parameters`() =
      assertFormatted(
          """
      |@AnnWithArrayValue(1, 2, 3) class C
      |"""
              .trimMargin())

  @Test
  fun `method modifiers`() =
      assertFormatted(
          """
      |override internal fun f() {}
      |"""
              .trimMargin())

  @Test
  fun `class modifiers`() =
      assertFormatted(
          """
      |abstract class Foo
      |
      |inner class Foo
      |
      |final class Foo
      |
      |open class Foo
      |"""
              .trimMargin())

  @Test
  fun `kdoc comments`() {
    val code =
        """
      |/**
      | * foo
      | */ class F {
      |
      | }
      |"""
            .trimMargin()
    val expected =
        """
      |/** foo */
      |class F {}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `nested kdoc comments`() {
    val code =
        """
      |/**
      | * foo /* bla */
      | */ class F {
      |
      | }
      |"""
            .trimMargin()
    val expected =
        """
      |/** foo /* bla */ */
      |class F {}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `nested kdoc inside code block`() =
      assertFormatted(
          """
      |/**
      | * ```
      | * edit -> { /* open edit screen */ }
      | * ```
      | */
      |fun foo() {}
      |"""
              .trimMargin())

  @Test
  fun `formatting kdoc doesn't add p HTML tags`() =
      assertFormatted(
          """
      |/**
      | * Bla bla bla bla
      | *
      | * This is an inferred paragraph, and as you can see, we don't add a p tag to it, even though bla
      | * bla.
      | *
      | * <p>On the other hand, we respect existing tags, and don't remove them.
      | */
      |"""
              .trimMargin())

  @Test
  fun `formatting kdoc preserves lists`() =
      assertFormatted(
          """
      |/**
      | * Here are some fruit I like:
      | * - Banana
      | * - Apple
      | *
      | * This is another paragraph
      | */
      |"""
              .trimMargin())

  @Test
  fun `formatting kdoc lists with line wraps breaks and merges correctly`() {
    val code =
        """
      |/**
      | * Here are some fruit I like:
      | * - Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana
      | * - Apple Apple Apple Apple
      | *   Apple Apple
      | *
      | * This is another paragraph
      | */
      |"""
            .trimMargin()
    val expected =
        """
      |/**
      | * Here are some fruit I like:
      | * - Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana Banana
      | *   Banana Banana Banana Banana Banana
      | * - Apple Apple Apple Apple Apple Apple
      | *
      | * This is another paragraph
      | */
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `formatting kdoc preserves lists of asterisks`() =
      assertFormatted(
          """
      |/**
      | * Here are some fruit I like:
      | * * Banana
      | * * Apple
      | *
      | * This is another paragraph
      | */
      |"""
              .trimMargin())

  @Test
  fun `formatting kdoc preserves numbered`() =
      assertFormatted(
          """
      |/**
      | * Here are some fruit I like:
      | * 1. Banana
      | * 2. Apple
      | *
      | * This is another paragraph
      | */
      |"""
              .trimMargin())

  @Test
  fun `formatting kdoc with markdown errors`() =
      assertFormatted(
          """
      |/** \[ */
      |fun markdownError() = Unit
      |"""
              .trimMargin())

  @Test
  fun `return statement with value`() =
      assertFormatted(
          """
      |fun random(): Int {
      |  return 4
      |}
      |"""
              .trimMargin())

  @Test
  fun `return statement without value`() =
      assertFormatted(
          """
      |fun print(b: Boolean) {
      |  print(b)
      |  return
      |}
      |"""
              .trimMargin())

  @Test
  fun `return expression without value`() =
      assertFormatted(
          """
      |fun print(b: Boolean?) {
      |  print(b ?: return)
      |}
      |"""
              .trimMargin())

  @Test
  fun `if statement without else`() =
      assertFormatted(
          """
      |fun maybePrint(b: Boolean) {
      |  if (b) {
      |    println(b)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `if statement with else`() =
      assertFormatted(
          """
      |fun maybePrint(b: Boolean) {
      |  if (b) {
      |    println(2)
      |  } else {
      |    println(1)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `if expression with else`() =
      assertFormatted(
          """
      |fun maybePrint(b: Boolean) {
      |  println(if (b) 1 else 2)
      |  println(
      |      if (b) {
      |        val a = 1 + 1
      |        2 * a
      |      } else 2)
      |  return if (b) 1 else 2
      |}
      |"""
              .trimMargin())

  @Test
  fun `if expression with break before else`() =
      assertFormatted(
          """
      |//////////////////////////////
      |fun compute(b: Boolean) {
      |  val c =
      |      if (a + b < 20) a + b
      |      else a
      |  return if (a + b < 20) a + b
      |  else c
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `if expression with break before expressions`() =
      assertFormatted(
          """
      |//////////////////////////
      |fun compute(b: Boolean) {
      |  val c =
      |      if (a + b < 20)
      |          a + b
      |      else if (a < 20) a
      |      else
      |          a + b + b + 1000
      |  return if (a + b < 20)
      |      a + b
      |  else c
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `blocky expressions in if-else`() =
      assertFormatted(
          """
      |fun numbers() {
      |  if (true)
      |      do {
      |        eat("is")
      |        matches += type()
      |      } while (eat(","))
      |  else
      |      while (1 < 2) {
      |        println("Everything is okay")
      |      }
      |}
      |"""
              .trimMargin())

  @Test
  fun `if expression with multiline condition`() =
      assertFormatted(
          """
      |////////////////////////////
      |fun foo() {
      |  if (expressions1 &&
      |      expression2 &&
      |      expression3) {
      |    bar()
      |  }
      |
      |  if (foo(
      |      expressions1 &&
      |          expression2 &&
      |          expression3)) {
      |    bar()
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `assignment expression on multiple lines`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |fun f() {
      |  var myVariable = 5
      |  myVariable =
      |      function1(4, 60, 8) + function2(57, 39, 20)
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `A program that tickled a bug in KotlinInput`() =
      assertFormatted(
          """
      |val x = 2
      |"""
              .trimMargin())

  @Test
  fun `a few variations of constructors`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////////
      |class Foo constructor(number: Int) {}
      |
      |class Foo2 private constructor(number: Int) {}
      |
      |class Foo3 @Inject constructor(number: Int) {}
      |
      |class Foo4 @Inject private constructor(number: Int) {}
      |
      |class Foo5
      |@Inject
      |private constructor(
      |    number: Int,
      |    number2: Int,
      |    number3: Int,
      |    number4: Int,
      |    number5: Int,
      |    number6: Int
      |) {}
      |
      |class Foo6
      |@Inject
      |private constructor(hasSpaceForAnnos: Innnt) {
      |  //                                           @Inject
      |}
      |
      |class FooTooLongForCtorAndSupertypes
      |@Inject
      |private constructor(x: Int) : NoooooooSpaceForAnnos {}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `a primary constructor without a class body `() =
      assertFormatted(
          """
      |/////////////////////////
      |data class Foo(
      |    val number: Int = 0
      |)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `a secondary constructor without a body`() =
      assertFormatted(
          """
      |///////////////////////////
      |data class Foo {
      |  constructor(
      |      val number: Int = 0
      |  )
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `a secondary constructor with a body breaks before closing parenthesis`() =
      assertFormatted(
          """
      |///////////////////////////
      |data class Foo {
      |  constructor(
      |      val number: Int = 0
      |  ) {}
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `a constructor with many arguments over breaking to next line`() =
      assertFormatted(
          """
      |data class Foo(
      |    val number: Int,
      |    val name: String,
      |    val age: Int,
      |    val title: String,
      |    val offspring2: List<Foo>
      |) {}
      |"""
              .trimMargin())

  @Test
  fun `a constructor with keyword and many arguments over breaking to next line`() =
      assertFormatted(
          """
      |data class Foo
      |constructor(
      |    val name: String,
      |    val age: Int,
      |    val title: String,
      |    val offspring: List<Foo>,
      |    val foo: String
      |) {}
      |"""
              .trimMargin())

  @Test
  fun `a constructor with many arguments over multiple lines`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |data class Foo
      |constructor(
      |    val number: Int,
      |    val name: String,
      |    val age: Int,
      |    val title: String,
      |    val offspring: List<Foo>
      |) {}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle secondary constructors`() =
      assertFormatted(
          """
      |class Foo private constructor(number: Int) {
      |  private constructor(n: Float) : this(1)
      |
      |  private constructor(n: Double) : this(1) {
      |    println("built")
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `a secondary constructor with many arguments over multiple lines`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |data class Foo {
      |  constructor(
      |      val number: Int,
      |      val name: String,
      |      val age: Int,
      |      val title: String,
      |      val offspring: List<Foo>
      |  )
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `a secondary constructor with many arguments passed to delegate`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |data class Foo {
      |  constructor(
      |      val number: Int,
      |      val name: String,
      |      val age: Int,
      |      val title: String,
      |      val offspring: List<Foo>
      |  ) : this(
      |      number,
      |      name,
      |      age,
      |      title,
      |      offspring,
      |      offspring)
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `a secondary constructor with no arguments passed to delegate`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////
      |data class Foo {
      |  constructor() :
      |      this(
      |          Foo.createSpeciallyDesignedParameter(),
      |          Foo.createSpeciallyDesignedParameter(),
      |      )
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `secondary constructor with param list that fits in one line, with delegate`() =
      assertFormatted(
          """
      |class C {
      |  constructor(
      |      context: Context?,
      |      attrs: AttributeSet?,
      |      defStyleAttr: Int,
      |      defStyleRes: Int
      |  ) : super(context, attrs, defStyleAttr, defStyleRes) {
      |    init(attrs)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle calling super constructor in secondary constructor`() =
      assertFormatted(
          """
      |class Foo : Bar {
      |  internal constructor(number: Int) : super(number) {}
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle super statement with with type argument`() =
      assertFormatted(
          """
      |class Foo : Bar(), FooBar {
      |  override fun doIt() {
      |    super<FooBar>.doIt()
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle super statement with with label argument`() =
      assertFormatted(
          """
      |class Foo : Bar(), FooBar {
      |  override fun doIt() {
      |    foo.doThat {
      |      super<FooBar>@Foo.doIt()
      |
      |      // this one is actually generics on the call expression, not super
      |      super@Foo<FooBar>.doIt()
      |    }
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `primary constructor without parameters with a KDoc`() =
      assertFormatted(
          """
      |class Class
      |/** A comment */
      |constructor() {}
      |"""
              .trimMargin())

  @Test
  fun `handle objects`() =
      assertFormatted(
          """
      |object Foo(n: Int) {}
      |"""
              .trimMargin())

  @Test
  fun `handle object expression`() =
      assertFormatted(
          """
      |fun f(): Any {
      |  return object : Adapter() {}
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle object expression in parenthesis`() =
      assertFormatted(
          """
      |fun f(): Any {
      |  return (object : Adapter() {})
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle array indexing operator`() =
      assertFormatted(
          """
      |fun f(a: Magic) {
      |  a[3]
      |  b[3, 4]
      |}
      |"""
              .trimMargin())

  @Test
  fun `keep array indexing grouped with expression is possible`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f(a: Magic) {
      |  foo.bar()
      |      .foobar[1, 2, 3]
      |  foo.bar()
      |      .foobar[
      |          1,
      |          2,
      |          3,
      |          4,
      |          5]
      |  foo.bar()
      |      .foobar[1, 2, 3]
      |      .barfoo[3, 2, 1]
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `mixed chains`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f(a: Magic) {
      |  foo.bar()
      |      .foobar[1, 2, 3]
      |  foo.bar()
      |      .foobar[
      |          1,
      |          2,
      |          3,
      |          4,
      |          5]
      |  foo.bar()
      |      .foobar[1, 2, 3]
      |      .barfoo[3, 2, 1]
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle destructuring declaration`() =
      assertFormatted(
          """
      |///////////////////////////////////////////////
      |fun f() {
      |  val (a, b: Int) = listOf(1, 2)
      |  val (asd, asd, asd, asd, asd, asd, asd) =
      |      foo.bar(asdasd, asdasd)
      |
      |  val (accountType, accountId) =
      |      oneTwoThreeFourFiveSixSeven(
      |          foo, bar, zed, boo)
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chains with derferences and array indexing`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  foo.bam()
      |      .uber!![0, 1, 2]
      |      .boom()[1, 3, 5]
      |      .lah
      |      .doo { it }
      |      .feep[1]
      |      as Boo
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `block like syntax after dereferences and indexing with short lines`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  foo.bam()
      |      .uber!![0, 1, 2]
      |      .forEach {
      |        println(it)
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `block like syntax after dereferences and indexing with long lines`() =
      assertFormatted(
          """
      |//////////////////////////////////
      |fun f() {
      |  foo.uber!![0, 1, 2].forEach {
      |    println(it)
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `try to keep type names together`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  com.facebook.foo.Foo(
      |      1, 2)
      |  com.facebook.foo
      |      .Foo(1, 2)
      |      .andAlsoThis()
      |  com.facebook.Foo.foo(
      |      1, 2)
      |  com.facebook
      |      .foobarFoo
      |      .foo(1, 2)
      |  foo.invoke(
      |      foo, bar, bar)
      |  foo.invoke(foo, bar)
      |      .invoke()
      |  FooFoo.foooooooo()
      |      .foooooooo()
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `avoid breaking brackets and keep them with array name`() =
      assertFormatted(
          """
      |/////////////////////////////////////////////////////////////////////////
      |fun f() {
      |  val a =
      |      invokeIt(context.packageName)
      |          .getInternalMutablePackageInfo(context.packageName)
      |          .someItems[0]
      |          .getInternalMutablePackageInfo(context.packageName)
      |          .someItems[0]
      |          .doIt()
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `keep function call with type name even if array expression is next`() =
      assertFormatted(
          """
      |class f {
      |  private val somePropertyWithBackingOne
      |    get() =
      |        _somePropertyWithBackingOne
      |            ?: Classname.getStuff<SomePropertyRelatedClassProvider>(requireContext())[
      |                    somePropertiesProvider, somePropertyCallbacks]
      |                .also { _somePropertyWithBackingOne = it }
      |}
      |"""
              .trimMargin())

  @Test
  fun `array access in middle of chain and end of it behaves similarly`() =
      assertFormatted(
          """
      |//////////////////////////////////////
      |fun f() {
      |  if (aaaaa == null ||
      |      aaaaa.bbbbb[0] == null ||
      |      aaaaa.bbbbb[0].cc == null ||
      |      aaaaa.bbbbb[0].dddd == null) {
      |    println()
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle qmark for nullable types`() =
      assertFormatted(
          """
      |var x: Int? = null
      |var x: (Int)? = null
      |var x: (Int?) = null
      |var x: ((Int))? = null
      |var x: ((Int?)) = null
      |var x: ((Int)?) = null
      |
      |var x: @Anno Int? = null
      |var x: @Anno() (Int)? = null
      |var x: @Anno (Int?) = null
      |var x: (@Anno Int)? = null
      |var x: (@Anno Int?) = null
      |var x: (@Anno() (Int))? = null
      |var x: (@Anno (Int?)) = null
      |var x: (@Anno() (Int)?) = null
      |"""
              .trimMargin())

  @Test
  fun `nullable function type`() =
      assertFormatted(
          """
      |var listener: ((Boolean) -> Unit)? = null
      |"""
              .trimMargin())

  @Test
  fun `redundant parenthesis in function types`() =
      assertFormatted(
          """
      |val a: (Int) = 7
      |
      |var listener: ((Boolean) -> Unit) = foo
      |"""
              .trimMargin())

  @Test
  fun `handle string literals`() =
      assertFormatted(
          """
      |fun doIt(world: String) {
      |  println("Hello world!")
      |  println("Hello! ${'$'}world")
      |  println("Hello! ${'$'}{"wor" + "ld"}")
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle multiline string literals`() =
      assertFormatted(
          """
      |fun doIt(world: String) {
      |  println(
      |      ${TQ}Hello
      |      world!${TQ})
      |  println(
      |      ${TQ}Hello
      |      world!${TQ},
      |      ${TQ}Goodbye
      |      world!${TQ})
      |}
      |"""
              .trimMargin())

  @Test
  fun `Trailing whitespaces are preserved in multiline strings`() {
    val code =
        listOf(
                "fun doIt(world: String) {",
                "  println(",
                "      ${TQ}This line has trailing whitespace         ",
                "      world!${TQ})",
                "  println(",
                "      ${TQ}This line has trailing whitespace \$s     ",
                "      world!${TQ})",
                "  println(",
                "      ${TQ}This line has trailing whitespace \${s}   ",
                "      world!${TQ})",
                "  println(",
                "      ${TQ}This line has trailing whitespace \$      ",
                "      world!${TQ})",
                "}",
                "")
            .joinToString("\n")
    assertThatFormatting(code).allowTrailingWhitespace().isEqualTo(code)
  }

  @Test
  fun `Consecutive line breaks in multiline strings are preserved`() =
      assertFormatted(
          """
      |val x =
      |    $TQ
      |
      |
      |
      |Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
      |$TQ
      |"""
              .trimMargin())

  @Test
  fun `Trailing spaces in a comment are not preserved`() {
    val before =
        listOf("// trailing spaces in a comment are not preserved       ", "").joinToString("\n")
    val after = listOf("// trailing spaces in a comment are not preserved", "").joinToString("\n")
    assertThatFormatting(before).allowTrailingWhitespace().isEqualTo(after)
  }

  @Test
  fun `Code with tombstones is not supported`() {
    val code =
        """
      |fun good() {
      |  // ${'\u0003'}
      |}
      |"""
            .trimMargin()
    try {
      Formatter.format(code)
      fail()
    } catch (e: ParseError) {
      assertThat(e.errorDescription).contains("\\u0003")
      assertThat(e.lineColumn.line).isEqualTo(1)
      assertThat(e.lineColumn.column).isEqualTo(5)
    }
  }

  @Test
  fun `handle some basic generics scenarios`() =
      assertFormatted(
          """
      |fun <T> doIt(a: List<T>): List<Int>? {
      |  val b: List<Int> = convert<Int>(listOf(5, 4))
      |  return b
      |}
      |
      |class Foo<T>
      |"""
              .trimMargin())

  @Test
  fun `handle for loops`() =
      assertFormatted(
          """
      |fun f(a: List<Int>) {
      |  for (i in a.indices) {
      |    println(i)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle for loops with long dot chains`() =
      assertFormatted(
          """
      |///////////////////////////////////
      |fun f(a: Node<Int>) {
      |  for (child in node.next.data()) {
      |    println(child)
      |  }
      |  for (child in
      |      node.next.next.data()) {
      |    println(child)
      |  }
      |  for (child in
      |      node.next.next.next.next
      |          .data()) {
      |    println(child)
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `when two lambdas following a call, indent the lambda properly`() =
      assertFormatted(
          """
      |////////////////////////////
      |fun f() {
      |  doIt()
      |      .apply {
      |        number =
      |            computeNumber1()
      |      }
      |      .apply {
      |        number = 2 * number
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `when two lambdas following a field, indent the lambda properly`() =
      assertFormatted(
          """
      |////////////////////////////
      |fun f() {
      |  field
      |      .apply {
      |        number =
      |            computeNumber1()
      |      }
      |      .apply {
      |        number = 2 * number
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `break after 'four' (even though it's 4 chars long) because there's a lambda afterwards`() =
      assertFormatted(
          """
      |fun f() {
      |  four
      |      .let {
      |        //
      |        foo()
      |      }
      |      .methodCall()
      |}
      |"""
              .trimMargin())

  @Test
  fun `keep last expression in qualified indented`() =
      assertFormatted(
          """
      |////////////////////////////
      |fun f() {
      |  Stuff()
      |      .doIt(
      |          Foo.doIt()
      |              .doThat())
      |      .doIt(
      |          Foo.doIt()
      |              .doThat())
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `properly place lambda arguments into blocks`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  foo {
      |    red.orange.yellow()
      |  }
      |
      |  foo.bar {
      |    red.orange.yellow()
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `properly handle one statement lambda with comment`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  foo {
      |    // this is a comment
      |    red.orange.yellow()
      |  }
      |  foo {
      |    /* this is also a comment */
      |    red.orange.yellow()
      |  }
      |  foo.bar {
      |    // this is a comment
      |    red.orange.yellow()
      |  }
      |  foo.bar() {
      |    // this is a comment
      |    red.orange.yellow()
      |  }
      |  foo.bar {
      |    /* this is also a comment */
      |    red.orange.yellow()
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `properly handle one statement lambda with comment after body statements`() =
      assertFormatted(
          """
      |///////////////////////
      |fun f() {
      |  foo {
      |    red.orange.yellow()
      |    // this is a comment
      |  }
      |  foo {
      |    red.orange.yellow()
      |    /* this is also a comment */
      |  }
      |  foo.bar {
      |    red.orange.yellow()
      |    // this is a comment
      |  }
      |  foo.bar() {
      |    red.orange.yellow()
      |    // this is a comment
      |  }
      |  foo.bar {
      |    red.orange.yellow()
      |    /* this is also a comment */
      |  }
      |  red.orange.yellow()
      |  // this is a comment
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `try to keep expression in the same line until the first lambda`() =
      assertFormatted(
          """
      |/////////////////////////
      |fun f() {
      |  foo.bar.bar?.let {
      |    a()
      |  }
      |  foo.bar.bar?.let {
      |    action()
      |    action2()
      |  }
      |  foo.bar.bar.bar.bar
      |      ?.let { a() }
      |  foo.bar.bar.bar.bar
      |      ?.let {
      |        action()
      |        action2()
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `different indentation in chained calls`() =
      assertFormatted(
          """
      |///////////////////////////
      |fun f() {
      |  fooDdoIt(
      |      foo1, foo2, foo3)
      |  foo.doIt(
      |      foo1, foo2, foo3)
      |  foo.doIt(
      |          foo1, foo2, foo3)
      |      .doThat()
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `always add a conditional break for a lambda which is not last`() =
      assertFormatted(
          """
      |////////////////////
      |fun f() {
      |  foofoo
      |      .doIt {
      |        doStuff()
      |      }
      |      .doIt {
      |        doStuff()
      |      }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `keep parenthesis and braces together when there's only one lambda argument`() =
      assertFormatted(
          """
      |fun f() {
      |  doIt({})
      |  doIt({ it + it })
      |  doIt({
      |    val a = it
      |    a + a
      |  })
      |  doIt(functor = { it + it })
      |  doIt(
      |      functor = {
      |        val a = it
      |        a + a
      |      })
      |}
      |"""
              .trimMargin())

  @Test
  fun `Qualified type`() =
      assertFormatted(
          """
      |fun f() {
      |  var plusFour: Indent.Const
      |  var x: Map.Entry<String, Integer>
      |  var x: List<String>.Iterator
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle destructuring declaration in for loop`() =
      assertFormatted(
          """
      |fun f(a: List<Pair<Int, Int>>) {
      |  for ((x, y: Int) in a) {}
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle function references`() =
      assertFormatted(
          """
      |////////////////////////////////
      |fun f(a: List<Int>) {
      |  a.forEach(::println)
      |  a.map(Int::toString)
      |  a.map(String?::isNullOrEmpty)
      |  a.map(
      |      SuperLongClassName?::
      |          functionName)
      |  val f =
      |      SuperLongClassName::
      |          functionName
      |  val g =
      |      invoke(a, b)::functionName
      |  val h =
      |      invoke(a, b, c)::
      |          functionName
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle escaped identifier`() =
      assertFormatted(
          """
      |import foo as `foo foo`
      |import org.mockito.Mockito.`when` as `yay yay`
      |
      |fun `spaces in functions`() {
      |  val `when` = NEVER
      |  val (`do not`, `ever write`) = SERIOUSLY
      |  val `a a`: Int
      |  `yay yay`(`foo foo`)
      |}
      |
      |class `more spaces`
      |"""
              .trimMargin())

  @Test
  fun `handle annotations with arguments`() =
      assertFormatted(
          """
      |@Px fun f(): Int = 5
      |
      |@Dimenstion(unit = DP) fun g(): Int = 5
      |
      |@RunWith(MagicRunner::class)
      |@Px
      |class Test {
      |  //
      |}
      |"""
              .trimMargin())

  @Test
  fun `no newlines after annotations if entire expr fits in one line`() =
      assertFormatted(
          """
      |///////////////////////////////////////////////
      |@Px @Px fun f(): Int = 5
      |
      |@Px
      |@Px
      |@Px
      |@Px
      |@Px
      |@Px
      |@Px
      |@Px
      |fun f(): Int = 5
      |
      |@Px
      |@Px
      |fun f(): Int {
      |  return 5
      |}
      |
      |@Dimenstion(unit = DP) @Px fun g(): Int = 5
      |
      |@Dimenstion(unit = DP)
      |@Px
      |fun g(): Int {
      |  return 5
      |}
      |
      |@RunWith @Px class Test
      |
      |@RunWith(MagicRunner::class) @Px class Test
      |
      |@RunWith @Px class Test {}
      |
      |@RunWith(MagicRunner::class) @Px class Test {}
      |
      |@RunWith(MagicRunner::class)
      |@Px
      |@Px
      |class Test {}
      |
      |@RunWith(MagicRunner::class)
      |@Px
      |class Test {
      |  //
      |}
      |
      |fun f() {
      |  if (@Stuff(Magic::class) isGood()) {
      |    println("")
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `no newlines after annotations on properties if entire expression fits in one line`() =
      assertFormatted(
          """
      |////////////////////////////////////////////
      |@Suppress("UnsafeCast")
      |val ClassA.methodA
      |  get() = foo as Bar
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `when annotations cause line breaks, and constant has no type dont break before value`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////////////////
      |object Foo {
      |  @LongLongLongLongAnnotation
      |  @LongLongLongLongLongAnnotation
      |  private val ROW_HEIGHT = 72
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `annotations in literal function types`() =
      assertFormatted(
          """
      |val callback: (@Anno List<@JvmSuppressWildcards String>) -> Unit = foo
      |"""
              .trimMargin())

  @Test
  fun `annotations on type parameters`() =
      assertFormatted(
          """
      |class Foo<@Anno out @Anno T, @Anno in @Anno U> {
      |  inline fun <@Anno reified @Anno X, @Anno reified @Anno Y> bar() {}
      |}
      |"""
              .trimMargin())

  @Test
  fun `annotations on type constraints`() =
      assertFormatted(
          """
      |class Foo<T : @Anno Kip, U> where U : @Anno Kip, U : @Anno Qux {
      |  fun <T : @Anno Kip, U> bar() where U : @Anno Kip, U : @Anno Qux {}
      |}
      |"""
              .trimMargin())

  @Test
  fun `annotations on type arguments`() =
      assertFormatted(
          """
      |fun foo(x: Foo<in @Anno Int>) {}
      |"""
              .trimMargin())

  @Test
  fun `annotations on destructuring declaration elements`() =
      assertFormatted(
          """
      |val x = { (@Anno x, @Anno y) -> x }
      |"""
              .trimMargin())

  @Test
  fun `annotations on exceptions`() =
      assertFormatted(
          """
      |fun doIt() {
      |  try {
      |    doItAgain()
      |  } catch (@Nullable e: Exception) {
      |    //
      |  } catch (@Suppress("GeneralException") e: Exception) {}
      |}
      |"""
              .trimMargin())

  @Test
  fun `annotations on return statements`() =
      assertFormatted(
          """
      |fun foo(): Map<String, Any> {
      |  @Suppress("AsCollectionCall")
      |  return map.asMap()
      |}
      |"""
              .trimMargin())

  @Test
  fun `Unary prefix expressions`() =
      assertFormatted(
          """
      |fun f() {
      |  !a
      |  -4
      |  val x = -foo()
      |  +4
      |  ++a
      |  --a
      |
      |  + +a
      |  +-a
      |  +!a
      |  -+a
      |  - -a
      |  -!a
      |  !+a
      |  !a
      |  ! !a
      |
      |  + ++a
      |  +--a
      |  -++a
      |  - --a
      |  !++a
      |  !--a
      |}
      |"""
              .trimMargin())

  @Test
  fun `Unary postfix expressions`() =
      assertFormatted(
          """
      |fun f() {
      |  a!!
      |  a++
      |  a--
      |
      |  a--!!
      |  a++!!
      |
      |  a!! !!
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle wildcard generics`() =
      assertFormatted(
          """
      |fun f() {
      |  val l: List<*>
      |  val p: Pair<*, *>
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle intersection generics`() =
      assertFormatted(
          """
      |fun f() {
      |  val l: Decl<A & B & C>
      |  val p = Ctor<A & B & C, T & Y & Z>
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle covariant and contravariant type arguments`() =
      assertFormatted(
          """
      |val p: Pair<in T, out S>
      |"""
              .trimMargin())

  @Test
  fun `handle covariant and contravariant type parameters`() =
      assertFormatted(
          """
      |class Foo<in T, out S>
      |"""
              .trimMargin())

  @Test
  fun `handle bounds for type parameters`() =
      assertFormatted(
          """
      |class Foo<in T : List<*>, out S : Any?>
      |"""
              .trimMargin())

  @Test
  fun `handle compound generic bounds on classes`() =
      assertFormatted(
          """
      |class Foo<T>(n: Int) where T : Bar, T : FooBar {}
      |"""
              .trimMargin())

  @Test
  fun `handle compound generic bounds on functions`() =
      assertFormatted(
          """
      |fun <T> foo(n: Int) where T : Bar, T : FooBar {}
      |"""
              .trimMargin())

  @Test
  fun `handle compound generic bounds on properties`() =
      assertFormatted(
          """
      |val <T> List<T>.twiceSum: Int where T : Int
      |  get() {
      |    return 2 * sum()
      |  }
      |"""
              .trimMargin())

  @Test
  fun `handle compound generic bounds on class with delegate`() =
      assertFormatted(
          """
      |class Foo<T>() : Bar by bar
      |where T : Qux
      |"""
              .trimMargin())

  @Test
  fun `explicit type on property getter`() =
      assertFormatted(
          """
      |class Foo {
      |  val silly: Int
      |    get(): Int = 1
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle method calls with lambda arg only`() =
      assertFormatted(
          """
      |fun f() {
      |  val a = g { 1 + 1 }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle method calls value args and a lambda arg`() =
      assertFormatted(
          """
      |fun f() {
      |  val a = g(1, 2) { 1 + 1 }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle top level constants`() =
      assertFormatted(
          """
      |/////////////////////////////
      |val a = 5
      |
      |const val b = "a"
      |
      |val a = 5
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle lambda arg with named arguments`() =
      assertFormatted(
          """
      |fun f() {
      |  val b = { x: Int, y: Int -> x + y }
      |}
      |"""
              .trimMargin())

  @Test
  fun `avoid newline before lambda argument if it is named`() =
      assertFormatted(
          """
      |private fun f(items: List<Int>) {
      |  doSomethingCool(
      |      items,
      |      lambdaArgument = {
      |        step1()
      |        step2()
      |      }) {
      |        it.doIt()
      |      }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle labeled this pointer`() =
      assertFormatted(
          """
      |class Foo {
      |  fun f() {
      |    g { println(this@Foo) }
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle extension and operator functions`() =
      assertFormatted(
          """
      |operator fun Point.component1() = x
      |"""
              .trimMargin())

  @Test
  fun `handle extension methods with very long names`() =
      assertFormatted(
          """
      |//////////////////////////////////////////
      |fun LongReceiverNameThatRequiresBreaking
      |    .doIt() {}
      |
      |fun LongButNotTooLong.doIt(
      |    n: Int,
      |    f: Float
      |) {}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle extension properties`() =
      assertFormatted(
          """
      |val Int.isPrime: Boolean
      |  get() = runMillerRabinPrimality(this)
      |"""
              .trimMargin())

  @Test
  fun `generic extension property`() =
      assertFormatted(
          """
      |val <T> List<T>.twiceSize = 2 * size()
      |"""
              .trimMargin())

  @Test
  fun `handle file annotations`() {
    assertFormatted(
        """
      |@file:JvmName("DifferentName")
      |
      |package com.somecompany.example
      |
      |import com.somecompany.example2
      |
      |class Foo {
      |  val a = example2("and 1")
      |}
      |"""
            .trimMargin())

    assertFormatted(
        """
      |@file:JvmName("DifferentName") // Comment
      |
      |package com.somecompany.example
      |
      |import com.somecompany.example2
      |
      |class Foo {
      |  val a = example2("and 1")
      |}
      |"""
            .trimMargin())

    assertFormatted(
        """
      |@file:JvmName("DifferentName")
      |
      |// Comment
      |
      |package com.somecompany.example
      |
      |import com.somecompany.example2
      |
      |class Foo {
      |  val a = example2("and 1")
      |}
      |"""
            .trimMargin())

    assertFormatted(
        """
      |@file:JvmName("DifferentName")
      |
      |// Comment
      |package com.somecompany.example
      |
      |import com.somecompany.example2
      |
      |class Foo {
      |  val a = example2("and 1")
      |}
      |"""
            .trimMargin())
  }

  @Test
  fun `handle init block`() =
      assertFormatted(
          """
      |class Foo {
      |  init {
      |    println("Init!")
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle interface delegation`() =
      assertFormatted(
          """
      |class MyList(impl: List<Int>) : Collection<Int> by impl
      |"""
              .trimMargin())

  @Test
  fun `handle property delegation`() =
      assertFormatted(
          """
      |val a by lazy { 1 + 1 }
      |"""
              .trimMargin())

  @Test
  fun `handle property delegation with type and breaks`() =
      assertFormatted(
          """
      |/////////////////////////////////
      |val importantValue: Int by lazy {
      |  1 + 1
      |}
      |
      |val importantValue: Int by lazy {
      |  val b = 1 + 1
      |  b + b
      |}
      |
      |val importantValueLonger:
      |    Int by lazy { 1 + 1 }
      |
      |val importantValue: Int by
      |    doIt(1 + 1)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle multi-annotations with use-site targets`() =
      assertFormatted(
          """
    |class Something {
    |  @field:[Inject Named("WEB_VIEW")]
    |  internal lateinit var httpClient: OkHttpClient
    |
    |  @field:[Inject Named("WEB_VIEW")]
    |  var httpClient: OkHttpClient
    |
    |  @Px
    |  @field:[Inject Named("WEB_VIEW")]
    |  var httpClient: OkHttpClient
    |}
    |
    """
              .trimMargin())

  @Test
  fun `handle parameters with annoations with parameters`() =
      assertFormatted(
          """
    |class Something {
    |  fun doIt(@Magic(withHat = true) foo: Foo) {
    |    println(foo)
    |  }
    |}
    |
    """
              .trimMargin())

  @Test
  fun `handle lambda types`() =
      assertFormatted(
          """
      |val listener1: (Boolean) -> Unit = { b -> !b }
      |
      |val listener2: () -> Unit = {}
      |
      |val listener3: (Int, Double) -> Int = { a, b -> a }
      |
      |val listener4: Int.(Int, Boolean) -> Unit
      |"""
              .trimMargin())

  @Test
  fun `handle unicode in string literals`() =
      assertFormatted(
          """
      |val a = "\uD83D\uDC4D"
      |"""
              .trimMargin())

  @Test
  fun `handle casting`() =
      assertFormatted(
          """
      |fun castIt(o: Object) {
      |  println(o is Double)
      |  println(o !is Double)
      |  doIt(o as Int)
      |  doIt(o as? Int)
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle casting with breaks`() =
      assertFormatted(
          """
      |///////////////////////
      |fun castIt(
      |    something: Any
      |) {
      |  doIt(
      |      something
      |          as List<*>)
      |  doIt(
      |      something
      |          is List<*>)
      |  println(
      |      something
      |          is
      |          List<String>)
      |  doIt(
      |      something
      |          as
      |          List<String>)
      |  println(
      |      something
      |          is
      |          PairList<
      |              String,
      |              Int>)
      |  doIt(
      |      something
      |          as
      |          PairList<
      |              String,
      |              Int>)
      |  println(
      |      a is Int &&
      |          b is String)
      |  l.b?.s?.sOrNull() is
      |      SomethingLongEnough
      |}
      |
      |val a =
      |    l.sOrNull() is
      |        SomethingLongEnough
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle collection literals in annotations`() =
      assertFormatted(
          """
      |@Foo(a = [1, 2])
      |fun doIt(o: Object) {
      |  //
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle try, catch and finally`() =
      assertFormatted(
          """
      |fun foo() {
      |  try {
      |    bar()
      |  } catch (e: Exception) {
      |    throw e
      |  } finally {
      |    println("finally")
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle infix methods`() =
      assertFormatted(
          """
      |fun numbers() {
      |  (0 until 100).size
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle while loops`() =
      assertFormatted(
          """
      |fun numbers() {
      |  while (1 < 2) {
      |    println("Everything is okay")
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle do while loops`() =
      assertFormatted(
          """
      |fun numbers() {
      |  do {
      |    println("Everything is okay")
      |  } while (1 < 2)
      |
      |  do while (1 < 2)
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle break and continue`() =
      assertFormatted(
          """
      |fun numbers() {
      |  while (1 < 2) {
      |    if (true) {
      |      break
      |    }
      |    if (false) {
      |      continue
      |    }
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle all kinds of labels and jumps`() =
      assertFormatted(
          """
      |fun f(a: List<Int>) {
      |  a.map {
      |    myloop@ for (i in a) {
      |      if (true) {
      |        break@myloop
      |      } else if (false) {
      |        continue@myloop
      |      } else {
      |        a.map `inner map`@{
      |          return@`inner map`
      |        }
      |      }
      |    }
      |    return@map 2 * it
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `don't crash on top level statements with semicolons`() {
    val code =
        """
      |val x = { 0 };
      |
      |foo({ 0 });
      |
      |foo { 0 };
      |
      |val fill = 0;
      |"""
            .trimMargin()
    val expected =
        """
      |val x = { 0 }
      |
      |foo({ 0 })
      |
      |foo { 0 }
      |
      |val fill = 0
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `preserve semicolons in enums`() {
    val code =
        """
      |enum class SemiColonIsNotRequired {
      |  TRUE, FALSE;
      |}
      |
      |enum class SemiColonIsRequired {
      |  ONE, TWO;
      |
      |  fun isOne(): Boolean = this == ONE
      |}
      |"""
            .trimMargin()
    val expected =
        """
      |enum class SemiColonIsNotRequired {
      |  TRUE,
      |  FALSE
      |}
      |
      |enum class SemiColonIsRequired {
      |  ONE,
      |  TWO;
      |
      |  fun isOne(): Boolean = this == ONE
      |}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `preserve semicolons in comments and strings`() {
    val code =
        """
      |fun f() {
      |  val x = ";"
      |  val x = $TQ  don't touch ; in raw strings $TQ
      |}
      |
      |// Don't touch ; inside comments.
      |
      |/** Don't touch ; inside comments. */
      |"""
            .trimMargin()
    val expected =
        """
      |fun f() {
      |  val x = ";"
      |  val x = $TQ  don't touch ; in raw strings $TQ
      |}
      |
      |// Don't touch ; inside comments.
      |
      |/** Don't touch ; inside comments. */
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `preserve semicolons in empty if-s and while-s`() {
    val code =
        """
      |fun f() {
      |  while (true);
      |  while (true) /** a */ ;
      |
      |  if (true);
      |  if (true) /** a */ ;
      |
      |  if (true)
      |    else
      |  ;
      |}
      |"""
            .trimMargin()
    val expected =
        """
      |fun f() {
      |  while (true) ;
      |  while (true)
      |  /** a */
      |  ;
      |
      |  if (true) ;
      |  if (true)
      |  /** a */
      |   ;
      |
      |  if (true)  else ;
      |}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `preserve semicolons between calls and dead lambdas`() {
    val code =
        """
      |fun f() {
      |  foo(0); { dead -> lambda }
      |
      |  foo(0) ; { dead -> lambda }
      |
      |  foo(0) /** a */ ; /** b */ { dead -> lambda }
      |
      |  foo(0) { trailing -> lambda }; { dead -> lambda }
      |
      |  foo { trailing -> lambda }; { dead -> lambda }
      |
      |  val x = foo(); { dead -> lambda }
      |
      |  val x = bar() && foo(); { dead -> lambda }
      |
      |  // `z` has a property and a method both named `bar`
      |  val x = z.bar; { dead -> lambda }
      |
      |  // `this` has a property and a method both named `bar`
      |  val x = bar; { dead -> lambda }
      |
      |  // Literally any callable expression is dangerous
      |  val x = (if (cond) x::foo else x::bar); { dead -> lambda }
      |
      |  funcCall(); { dead -> lambda }.withChained(call)
      |}
      |"""
            .trimMargin()
    val expected =
        """
      |fun f() {
      |  foo(0);
      |  { dead -> lambda }
      |
      |  foo(0);
      |  { dead -> lambda }
      |
      |  foo(0)
      |  /** a */
      |  ;
      |  /** b */
      |  { dead -> lambda }
      |
      |  foo(0) { trailing -> lambda };
      |  { dead -> lambda }
      |
      |  foo { trailing -> lambda };
      |  { dead -> lambda }
      |
      |  val x = foo();
      |  { dead -> lambda }
      |
      |  val x = bar() && foo();
      |  { dead -> lambda }
      |
      |  // `z` has a property and a method both named `bar`
      |  val x = z.bar;
      |  { dead -> lambda }
      |
      |  // `this` has a property and a method both named `bar`
      |  val x = bar;
      |  { dead -> lambda }
      |
      |  // Literally any callable expression is dangerous
      |  val x = (if (cond) x::foo else x::bar);
      |  { dead -> lambda }
      |
      |  funcCall();
      |  { dead -> lambda }.withChained(call)
      |}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `drop redundant semicolons`() {
    val code =
        """
      |package org.examples;
      |import org.examples.wow.MuchWow;
      |import org.examples.wow.ManyAmaze
      |
      |typealias Int2 = Int;
      |
      |fun f() {
      |  val a = 3;
      |  val x = 5 ; val y = ManyAmaze();
      |  myThingMap.forEach { val (key, value) = it; println("mapped ${"$"}MuchWow") }
      |  when {
      |    true -> "1"; false -> "0"
      |  }
      |  someLongVariableName.let {
      |    someReallyLongFunctionNameThatMakesThisNotFitInOneLineWithTheAboveVariable();
      |  }
      |  if (cond) ; else 6
      |} ;
      |
      |"""
            .trimMargin()
    val expected =
        """
      |package org.examples
      |
      |import org.examples.wow.ManyAmaze
      |import org.examples.wow.MuchWow
      |
      |typealias Int2 = Int
      |
      |fun f() {
      |  val a = 3
      |  val x = 5
      |  val y = ManyAmaze()
      |  myThingMap.forEach {
      |    val (key, value) = it
      |    println("mapped ${"$"}MuchWow")
      |  }
      |  when {
      |    true -> "1"
      |    false -> "0"
      |  }
      |  someLongVariableName.let {
      |    someReallyLongFunctionNameThatMakesThisNotFitInOneLineWithTheAboveVariable()
      |  }
      |  if (cond)  else 6
      |}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `pretty-print after dropping redundant semicolons`() {
    val code =
        """
      |fun f() {
      |  val veryLongName = 5;
      |}
      |"""
            .trimMargin()
    val expected =
        """
      |fun f() {
      |  val veryLongName = 5
      |}
      |"""
            .trimMargin()
    assertThatFormatting(code)
        .withOptions(defaultTestFormattingOptions.copy(maxWidth = 22))
        .isEqualTo(expected)
  }

  @Test
  fun `handle no parenthesis in lambda calls`() =
      assertFormatted(
          """
      |fun f() {
      |  a { println("a") }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle multi statement lambdas`() =
      assertFormatted(
          """
      |fun f() {
      |  a {
      |    println("a")
      |    println("b")
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle multi line one statement lambda`() =
      assertFormatted(
          """
      |/////////////////////////
      |fun f() {
      |  a {
      |    println(foo.bar.boom)
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `statements are wrapped in blocks`() =
      assertFormatted(
          """
      |fun f() {
      |  builder.block {
      |    getArgumentName().accept
      |    return
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `properly break fully qualified nested user types`() =
      assertFormatted(
          """
      |///////////////////////////////////////////////////////
      |val complicated:
      |    com.example.interesting.SomeType<
      |        com.example.interesting.SomeType<Int, Nothing>,
      |        com.example.interesting.SomeType<
      |            com.example.interesting.SomeType<
      |                Int, Nothing>,
      |            Nothing>> =
      |    DUMMY
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle multi-line lambdas within lambdas and calling chains`() =
      assertFormatted(
          """
      |fun f() {
      |  builder.block(ZERO) {
      |    builder.token("when")
      |    expression1.let { subjectExp ->
      |      builder.token(")")
      |      return
      |    }
      |  }
      |  builder.block(ZERO) {
      |    expression2.subjectExpression.let { subjectExp ->
      |      builder.token(")")
      |      return
      |    }
      |  }
      |  builder.block(ZERO) {
      |    expression2.subjectExpression
      |        .let { subjectExp ->
      |          builder.token(")")
      |          return
      |        }
      |        .sum
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle multi line lambdas with explicit args`() =
      assertFormatted(
          """
      |////////////////////
      |fun f() {
      |  a { (x, y) ->
      |    x + y
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle lambda with destructuring and type`() =
      assertFormatted(
          """
      |fun f() {
      |  g { (a, b): List<Int> -> a }
      |  g { (a, b): List<Int>, (c, d): List<Int> -> a }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle parenthesis in lambda calls for now`() =
      assertFormatted(
          """
      |fun f() {
      |  a() { println("a") }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle chaining of calls with lambdas`() =
      assertFormatted(
          """
      |fun f() {
      |  bobby
      |      .map { x -> x * x }
      |      .map { x -> x * x }
      |      ?.map { x ->
      |        val y = x * x
      |        y
      |      }
      |      .sum
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle break of lambda args per line with indentation`() =
      assertFormatted(
          """
      |///////////
      |fun f() {
      |  a() {
      |      arg1,
      |      arg2,
      |      x ->
      |    doIt()
      |    doIt()
      |  }
      |  a() {
      |      arg1,
      |      arg2,
      |      arg3
      |    ->
      |    doIt()
      |    doIt()
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing comma in lambda`() =
      assertFormatted(
          """
      |///////////
      |fun f() {
      |  a() {
      |      arg1,
      |      arg2,
      |      x,
      |    ->
      |    doIt()
      |    doIt()
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `break before Elvis operator`() =
      assertFormatted(
          """
        |//////////////////////////////////////////////////
        |fun f() {
        |  someObject
        |      .someMethodReturningCollection()
        |      .map { it.someProperty }
        |      .find { it.contains(someSearchValue) }
        |      ?: someDefaultValue
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chain of Elvis operator`() =
      assertFormatted(
          """
        |///////////////////////////
        |fun f() {
        |  return option1()
        |      ?: option2()
        |      ?: option3()
        |      ?: option4()
        |      ?: option5()
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `Elvis operator mixed with plus operator breaking on plus`() =
      assertFormatted(
          """
        |////////////////////////
        |fun f() {
        |  return option1()
        |      ?: option2() +
        |          option3()
        |      ?: option4() +
        |          option5()
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `Elvis operator mixed with plus operator breaking on elvis`() =
      assertFormatted(
          """
        |/////////////////////////////////
        |fun f() {
        |  return option1()
        |      ?: option2() + option3()
        |      ?: option4() + option5()
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle comments in the middle of calling chain`() =
      assertFormatted(
          """
        |///////////////////////////
        |fun f() {
        |  someObject
        |      .letsDoIt()
        |      // this is a comment
        |      .doItOnce()
        |      // this is a comment
        |      .doItTwice()
        |}
        |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle reified types`() =
      assertFormatted(
          """
      |inline fun <reified T> foo(t: T) {
      |  println(t)
      |}
      |
      |inline fun <reified in T> foo2(t: T) {
      |  println(t)
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle suspended types`() =
      assertFormatted(
          """
      |private val reader: suspend (Key) -> Output?
      |
      |private val delete: (suspend (Key) -> Unit)? = null
      |
      |inline fun <R> foo(noinline block: suspend () -> R): suspend () -> R
      |
      |inline fun <R> bar(noinline block: (suspend () -> R)?): (suspend () -> R)?
      |"""
              .trimMargin())

  @Test
  fun `handle simple enum classes`() =
      assertFormatted(
          """
      |enum class BetterBoolean {
      |  TRUE,
      |  FALSE,
      |  FILE_NOT_FOUND,
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle enum class with functions`() =
      assertFormatted(
          """
      |enum class BetterBoolean {
      |  TRUE,
      |  FALSE,
      |  FILE_NOT_FOUND;
      |
      |  fun isGood(): Boolean {
      |    return true
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle enum with annotations`() =
      assertFormatted(
          """
      |enum class BetterBoolean {
      |  @True TRUE,
      |  @False @WhatIsTruth FALSE,
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle enum constructor calls`() =
      assertFormatted(
          """
      |enum class BetterBoolean(val name: String, val value: Boolean = true) {
      |  TRUE("true"),
      |  FALSE("false", false),
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle enum entries with body`() =
      assertFormatted(
          """
      |enum class Animal(canWalk: Boolean = true) {
      |  DOG {
      |    fun speak() = "woof"
      |  },
      |  FISH(false) {},
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle empty enum`() =
      assertFormatted(
          """
      |enum class YTho {}
      |"""
              .trimMargin())

  @Test
  fun `expect enum class`() =
      assertFormatted(
          """
      |expect enum class ExpectedEnum
      |"""
              .trimMargin())

  @Test
  fun `enum without trailing comma`() =
      assertFormatted(
          """
      |enum class Highlander {
      |  ONE
      |}
      |"""
              .trimMargin())

  @Test
  fun `enum comma and semicolon`() {
    assertThatFormatting(
            """
        |enum class Highlander {
        |  ONE,;
        |}
        |"""
                .trimMargin())
        .isEqualTo(
            """
        |enum class Highlander {
        |  ONE,
        |}
        |"""
                .trimMargin())
  }

  @Test
  fun `empty enum with semicolons`() {
    assertThatFormatting(
            """
        |enum class Empty {
        |  ;
        |}
        |"""
                .trimMargin())
        .isEqualTo(
            """
        |enum class Empty {}
        |"""
                .trimMargin())

    assertThatFormatting(
            """
        |enum class Empty {
        |  ;
        |  ;
        |  ;
        |}
        |"""
                .trimMargin())
        .isEqualTo(
            """
        |enum class Empty {}
        |"""
                .trimMargin())
  }

  @Test
  fun `semicolon is placed on next line when there's a trailing comma in an enum declaration`() =
      assertFormatted(
          """
        |enum class Highlander {
        |  ONE,
        |  TWO,
        |  ;
        |
        |  fun f() {}
        |}
        |"""
              .trimMargin())

  @Test
  fun `semicolon is removed from empty enum`() {
    val code =
        """
        |enum class SingleSemi {
        |  ;
        |}
        |
        |enum class MultSemi {
        |  // a
        |  ;
        |  // b
        |  ;
        |  // c
        |  ;
        |}
        |"""
            .trimMargin()
    val expected =
        """
        |enum class SingleSemi {}
        |
        |enum class MultSemi {
        |  // a
        |
        |  // b
        |
        |  // c
        |
        |}
        |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `semicolon management in enum with no entries but other members`() {
    val code =
        """
        |enum class Empty {
        |  ;
        |
        |  fun f() {}
        |  ;
        |  fun g() {}
        |}
        |"""
            .trimMargin()
    val expected =
        """
        |enum class Empty {
        |  ;
        |
        |  fun f() {}
        |
        |  fun g() {}
        |}
        |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `handle varargs and spread operator`() =
      assertFormatted(
          """
      |fun foo(vararg args: String) {
      |  foo2(*args)
      |  foo3(options = *args)
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle typealias`() =
      assertFormatted(
          """
      |//////////////////////////////////////////////
      |private typealias TextChangedListener =
      |    (string: String) -> Unit
      |
      |typealias PairPair<X, Y> = Pair<Pair<X, Y>, X>
      |
      |class Foo
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle the 'dynamic' type`() =
      assertFormatted(
          """
      |fun x(): dynamic = "x"
      |
      |val dyn: dynamic = 1
      |"""
              .trimMargin())

  @Test
  fun `handle class expression with generics`() =
      assertFormatted(
          """
      |fun f() {
      |  println(Array<String>::class.java)
      |}
      |"""
              .trimMargin())

  @Test
  fun `ParseError contains correct line and column numbers`() {
    val code =
        """
      |// Foo
      |fun good() {
      |  //
      |}
      |
      |fn (
      |"""
            .trimMargin()
    try {
      Formatter.format(code)
      fail()
    } catch (e: ParseError) {
      assertThat(e.lineColumn.line).isEqualTo(6)
      assertThat(e.lineColumn.column).isEqualTo(0)
      assertThat(e.errorDescription).contains("Expecting an expression")
    }
  }

  @Test
  fun `fail() reports line+column number`() {
    val code =
        """
      |// Foo
      |fun good() {
      |  return@ 5
      |}
      |"""
            .trimMargin()
    try {
      Formatter.format(code)
      fail()
    } catch (e: ParseError) {
      assertThat(e.lineColumn.line).isEqualTo(2)
      assertThat(e.lineColumn.column).isEqualTo(8)
    }
  }

  @Test
  fun `annotations on class, fun, parameters and literals`() =
      assertFormatted(
          """
      |@Fancy
      |class Foo {
      |  @Fancy
      |  fun baz(@Fancy foo: Int): Int {
      |    return (@Fancy 1)
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `annotations on function types`() =
      assertFormatted(
          """
      |fun foo(bar: @StringRes Int) {}
      |
      |fun foo(error: @Composable ((x) -> Unit)) {}
      |
      |fun foo(error: (@Composable (x) -> Unit)) {}
      |
      |fun foo(
      |    error:
      |        @field:[Inject Named("WEB_VIEW")]
      |        ((x) -> Unit)
      |) {}
      |
      |fun foo(
      |    error:
      |        (@field:[Inject Named("WEB_VIEW")]
      |        (x) -> Unit)
      |) {}
      |"""
              .trimMargin())

  @Test
  fun `handle annotations with use-site targets`() =
      assertFormatted(
          """
      |class FooTest {
      |  @get:Rule val exceptionRule: ExpectedException = ExpectedException.none()
      |
      |  @set:Magic(name = "Jane") var field: String
      |}
      |"""
              .trimMargin())

  @Test
  fun `handle annotations mixed with keywords since we cannot reorder them for now`() =
      assertFormatted(
          """
      |public @Magic final class Foo
      |
      |public @Magic(1) final class Foo
      |
      |@Magic(1) public final class Foo
      |"""
              .trimMargin())

  @Test
  fun `handle annotations more`() =
      assertFormatted(
          """
      |/////////////////////////////////////////////////
      |@Anno1
      |@Anno2(param = Param1::class)
      |@Anno3
      |@Anno4(param = Param2::class)
      |class MyClass {}
      |
      |fun f() {
      |  @Suppress("MagicNumber") add(10)
      |
      |  @Annotation // test a comment after annotations
      |  return 5
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `annotated expressions`() =
      assertFormatted(
          """
      |////////////////////////////////////////////////
      |fun f() {
      |  @Suppress("MagicNumber") add(10) && add(20)
      |
      |  @Suppress("MagicNumber")
      |  add(10) && add(20)
      |
      |  @Anno1 @Anno2(param = Param1::class)
      |  add(10) && add(20)
      |
      |  @Anno1
      |  @Anno2(param = Param1::class)
      |  @Anno3
      |  @Anno4(param = Param2::class)
      |  add(10) && add(20)
      |
      |  @Anno1
      |  @Anno2(param = Param1::class)
      |  @Anno3
      |  @Anno4(param = Param2::class)
      |  add(10) && add(20)
      |
      |  @Suppress("MagicNumber") add(10) &&
      |      add(20) &&
      |      add(30)
      |
      |  add(@Suppress("MagicNumber") 10) &&
      |      add(20) &&
      |      add(30)
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `annotated function declarations`() =
      assertFormatted(
          """
      |@Anno
      |fun f() {
      |  add(10)
      |}
      |
      |@Anno(param = 1)
      |fun f() {
      |  add(10)
      |}
      |"""
              .trimMargin())

  @Test
  fun `annotated class declarations`() =
      assertFormatted(
          """
      |@Anno class F
      |
      |@Anno(param = 1) class F
      |
      |@Anno(P)
      |// Foo
      |@Anno("param")
      |class F
      |"""
              .trimMargin())

  @Test
  fun `handle type arguments in annotations`() =
      assertFormatted(
          """
      |@TypeParceler<UUID, UUIDParceler>() class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle one line KDoc`() =
      assertFormatted(
          """
      |/** Hi, I am a one line kdoc */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with Link`() =
      assertFormatted(
          """
      |/** This links to [AnotherClass] */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with paragraphs`() =
      assertFormatted(
          """
      |/**
      | * Hi, I am a two paragraphs kdoc
      | *
      | * There's a space line to preserve between them
      | */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with blocks`() =
      assertFormatted(
          """
      |/**
      | * Hi, I am a two paragraphs kdoc
      | *
      | * @param param1 this is param1
      | * @param[param2] this is param2
      | */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with code examples`() =
      assertFormatted(
          """
      |/**
      | * This is how you write a simple hello world in Kotlin:
      | * ```
      | * fun main(args: Array<String>) {
      | *   println("Hello World!")
      | * }
      | * ```
      | *
      | * Amazing ah?
      | *
      | * ```
      | * fun `code can be with a blank line above it` () {}
      | * ```
      | *
      | * Or after it!
      | */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with tagged code examples`() =
      assertFormatted(
          """
      |/**
      | * ```kotlin
      | * fun main(args: Array<String>) {
      | *   println("Hello World!")
      | * }
      | * ```
      | */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle stray code markers in lines and produce stable output`() {
    val code =
        """
      |/**
      | * Look! code: ``` aaa
      | * fun f() = Unit
      | * foo
      | * ```
      | */
      |class MyClass {}
      |"""
            .trimMargin()
    assertFormatted(Formatter.format(code))
  }

  @Test
  fun `code block with triple backtick`() {
    val code =
        """
      |/**
      | * Look! code:
      | * ```
      | * aaa ``` wow
      | * ```
      | */
      |class MyClass {}
      |"""
            .trimMargin()
    val expected =
        """
      |/**
      | * Look! code:
      | * ```
      | * aaa ``` wow
      | * ```
      | */
      |class MyClass {}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `when code closer in mid of line, produce stable output`() {
    val code =
        """
      |/**
      | * Look! code: ``` aaa
      | * fun f() = Unit
      | * foo ``` wow
      | */
      |class MyClass {}
      |"""
            .trimMargin()
    assertFormatted(Formatter.format(code))
  }

  @Test
  fun `handle KDoc with link reference`() =
      assertFormatted(
          """
      |/** Doc line with a reference to [AnotherClass] in the middle of a sentence */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with links one after another`() =
      assertFormatted(
          """
      |/** Here are some links [AnotherClass] [AnotherClass2] */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `don't add spaces after links in Kdoc`() =
      assertFormatted(
          """
      |/** Here are some links [AnotherClass][AnotherClass2]hello */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `don't remove spaces after links in Kdoc`() =
      assertFormatted(
          """
      |/** Please see [onNext] (which has more details) */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `link anchor in KDoc are preserved`() =
      assertFormatted(
          """
      |/** [link anchor](the URL for the link anchor goes here) */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `don't add spaces between links in KDoc (because they're actually references)`() =
      assertFormatted(
          """
      |/** Here are some links [AnotherClass][AnotherClass2] */
      |class MyClass {}
      |
      |/** The final produced value may have [size][ByteString.size] < [bufferSize]. */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `collapse spaces after links in KDoc`() {
    val code =
        """
      |/** Here are some links [Class1], [Class2]   [Class3]. hello */
      |class MyClass {}
      |"""
            .trimMargin()
    val expected =
        """
      |/** Here are some links [Class1], [Class2] [Class3]. hello */
      |class MyClass {}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `collapse newlines after links in KDoc`() {
    val code =
        """
      |/**
      | * Here are some links [Class1]
      | * [Class2]
      | */
      |class MyClass {}
      |"""
            .trimMargin()
    val expected =
        """
      |/** Here are some links [Class1] [Class2] */
      |class MyClass {}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `do not crash because of malformed KDocs and produce stable output`() {
    val code =
        """
      |/** Surprise ``` */
      |class MyClass {}
      |"""
            .trimMargin()
    assertFormatted(Formatter.format(code))
  }

  @Test
  fun `Respect spacing of text after link`() =
      assertFormatted(
          """
      |/** Enjoy this link [linkstuff]. */
      |class MyClass {}
      |
      |/** There are many [FooObject]s. */
      |class MyClass {}
      |"""
              .trimMargin())

  @Test
  fun `handle KDoc with multiple separated param tags, breaking and merging lines and missing asterisk`() {
    val code =
        """
      |/**
      | * Trims leading whitespace characters followed by [marginPrefix] from every line of a source string and removes
      | * the first and the last lines if they are blank (notice difference blank vs empty).
      |
      | * Doesn't affect a line if it doesn't contain [marginPrefix] except the first and the last blank lines.
      | *
      | * Doesn't preserve the original line endings.
      | *
      | * @param marginPrefix non-blank string, which is used as a margin delimiter. Default is `|` (pipe character).
      | *
      | * @sample samples.text.Strings.trimMargin
      | * @see trimIndent
      | * @see kotlin.text.isWhitespace
      | */
      |class ThisWasCopiedFromTheTrimMarginMethod {}
      |"""
            .trimMargin()
    val expected =
        """
      |/**
      | * Trims leading whitespace characters followed by [marginPrefix] from every line of a source string
      | * and removes the first and the last lines if they are blank (notice difference blank vs empty).
      | *
      | * Doesn't affect a line if it doesn't contain [marginPrefix] except the first and the last blank
      | * lines.
      | *
      | * Doesn't preserve the original line endings.
      | *
      | * @param marginPrefix non-blank string, which is used as a margin delimiter. Default is `|` (pipe
      | *   character).
      | * @sample samples.text.Strings.trimMargin
      | * @see trimIndent
      | * @see kotlin.text.isWhitespace
      | */
      |class ThisWasCopiedFromTheTrimMarginMethod {}
      |"""
            .trimMargin()
    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `KDoc is reflowed`() {
    val code =
        """
      |/** Lorem ipsum dolor sit amet, consectetur */
      |class MyClass {}
      |"""
            .trimMargin()
    val expected =
        """
      |/**
      | * Lorem ipsum dolor sit amet,
      | * consectetur
      | */
      |class MyClass {}
      |"""
            .trimMargin()
    assertThatFormatting(code)
        .withOptions(defaultTestFormattingOptions.copy(maxWidth = 33))
        .isEqualTo(expected)
  }

  @Test
  fun `sanity - block and continuation indents are 4`() {
    val code =
        """
        |fun f() {
        |    for (child in
        |        node.next.next.next.next
        |            .data()) {
        |        println(child)
        |    }
        |}
        |"""
            .trimMargin()
    assertThatFormatting(code)
        .withOptions(
            FormattingOptions(
                maxWidth = 35,
                blockIndent = 4,
                continuationIndent = 4,
                manageTrailingCommas = false,
            ),
        )
        .isEqualTo(code)
  }

  @Test
  fun `comment after a block is stable and does not add space lines`() =
      assertFormatted(
          """
      |fun doIt() {}
      |
      |/* this is the first comment */
      |"""
              .trimMargin())

  @Test
  fun `preserve LF, CRLF and CR line endings`() {
    val lines = listOf("fun main() {", "  println(\"test\")", "}")
    for (ending in listOf("\n", "\r\n", "\r")) {
      val code = lines.joinToString(ending) + ending
      assertThatFormatting(code).isEqualTo(code)
    }
  }

  @Test
  fun `handle trailing commas (constructors)`() =
      assertFormatted(
          """
      |////////////////////
      |class Foo(
      |    a: Int,
      |)
      |
      |class Foo(
      |    a: Int,
      |    b: Int,
      |)
      |
      |class Foo(
      |    a: Int,
      |    b: Int
      |)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (explicit constructors)`() =
      assertFormatted(
          """
      |////////////////////////
      |class Foo
      |constructor(
      |    a: Int,
      |)
      |
      |class Foo
      |constructor(
      |    a: Int,
      |    b: Int,
      |)
      |
      |class Foo
      |constructor(
      |    a: Int,
      |    b: Int
      |)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (secondary constructors)`() =
      assertFormatted(
          """
      |////////////////////////
      |class Foo {
      |  constructor(
      |      a: Int,
      |  )
      |}
      |
      |class Foo {
      |  constructor(
      |      a: Int,
      |      b: Int,
      |  )
      |}
      |
      |class Foo {
      |  constructor(
      |      a: Int,
      |      b: Int
      |  )
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (function definitions)`() =
      assertFormatted(
          """
      |////////////////////////
      |fun <
      |    T,
      |> foo() {}
      |
      |fun <
      |    T,
      |    S,
      |> foo() {}
      |
      |fun foo(
      |    a: Int,
      |) {}
      |
      |fun foo(
      |    a: Int,
      |    b: Int
      |) {}
      |
      |fun foo(
      |    a: Int,
      |    b: Int,
      |) {}
      |
      |fun foo(
      |    a: Int,
      |    b: Int,
      |    c: Int,
      |) {}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (function calls)`() =
      assertFormatted(
          """
      |////////////////////////
      |fun main() {
      |  foo(
      |      3,
      |  )
      |
      |  foo<Int>(
      |      3,
      |  )
      |
      |  foo<
      |      Int,
      |  >(
      |      3,
      |  )
      |
      |  foo<Int>(
      |      "asdf", "asdf")
      |
      |  foo<
      |      Int,
      |  >(
      |      "asd",
      |      "asd",
      |  )
      |
      |  foo<
      |      Int,
      |      Boolean,
      |  >(
      |      3,
      |  )
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (proprties)`() =
      assertFormatted(
          """
      |//////////////////////////
      |val foo: String
      |  set(
      |      value,
      |  ) {}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (higher-order functions)`() =
      assertFormatted(
          """
      |//////////////////////////
      |fun foo(
      |    x:
      |        (
      |            Int,
      |        ) -> Unit
      |) {}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (after lambda arg)`() =
      assertFormatted(
          """
      |//////////////////////////
      |fun foo() {
      |  foo(
      |      { it },
      |  )
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `handle trailing commas (other)`() =
      assertFormatted(
          """
      |//////////////////////////
      |fun main() {
      |  val (
      |      x: Int,
      |  ) = foo()
      |  val (
      |      x: Int,
      |      y: Int,
      |  ) = foo()
      |
      |  val (
      |      x: Int,
      |  ) = foo(
      |      blablablablFoobar,
      |      alskdjasld)
      |
      |  val (
      |      x: Int,
      |      y: Int,
      |  ) = foo(
      |      blablablablFoobar,
      |      asldkalsd)
      |
      |  a[
      |      0,
      |  ] = 43
      |  a[
      |      0,
      |      1,
      |  ] = 43
      |
      |  [
      |      0,
      |  ]
      |  [
      |      0,
      |      1,
      |  ]
      |
      |  when (foo) {
      |    'x', -> 43
      |    'x',
      |    'y', -> 43
      |    'x',
      |    'y',
      |    'z',
      |    'w',
      |    'a',
      |    'b', -> 43
      |  }
      |
      |  try {
      |    //
      |  } catch (e: Error,) {
      |    //
      |  }
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `assignment of a scoping function`() =
      assertFormatted(
          """
      |////////////////////////////
      |val foo = coroutineScope {
      |  foo()
      |  //
      |}
      |
      |fun foo() = coroutineScope {
      |  foo()
      |  //
      |}
      |
      |fun foo() = use { x ->
      |  foo()
      |  //
      |}
      |
      |fun foo() = scope label@{
      |  foo()
      |  //
      |}
      |
      |fun foo() =
      |    coroutineScope { x ->
      |      foo()
      |      //
      |    }
      |
      |fun foo() =
      |    coroutineScope label@{
      |      foo()
      |      //
      |    }
      |
      |fun foo() =
      |    Runnable @Px {
      |      foo()
      |      //
      |    }
      |
      |fun longName() =
      |    coroutineScope {
      |      foo()
      |      //
      |    }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `top level properties with other types preserve newline spacing`() {
    assertFormatted(
        """
      |/////////////////////////////////
      |fun something() {
      |  println("hi")
      |}
      |
      |const val SOME_CONST = 1
      |val SOME_STR = "hi"
      |// Single comment
      |val SOME_INT = 1
      |
      |// Intentional space above single comment
      |val SOME_INT2 = 1
      |
      |val FOO = 2
      |const val BAR = 3
      |
      |fun baz() = 1
      |
      |val d = 1
      |
      |class Bar {}
      |
      |val e = 1
      |/** Doc block */
      |val f = 1
      |
      |/** Intent. space above doc */
      |val g = 1
      |
      |data class Qux(val foo: String)
      |"""
            .trimMargin(),
        deduceMaxWidth = true)

    assertThatFormatting(
            """
      |import com.example.foo
      |import com.example.bar
      |const val SOME_CONST = foo.a
      |val SOME_STR = bar.a
      |"""
                .trimMargin())
        .isEqualTo(
            """
      |import com.example.bar
      |import com.example.foo
      |
      |const val SOME_CONST = foo.a
      |val SOME_STR = bar.a
      |"""
                .trimMargin())
  }

  @Test
  fun `first line is never empty`() =
      assertThatFormatting(
              """
      |
      |fun f() {}
      |"""
                  .trimMargin())
          .isEqualTo(
              """
      |fun f() {}
      |"""
                  .trimMargin())

  @Test
  fun `at most one newline between any adjacent top-level elements`() =
      assertThatFormatting(
              """
      |import com.Bar
      |
      |
      |import com.Foo
      |
      |
      |fun f() {}
      |
      |
      |fun f() {}
      |
      |
      |class C {}
      |
      |
      |class C {}
      |
      |
      |val x = Foo()
      |
      |
      |val x = Bar()
      |"""
                  .trimMargin())
          .isEqualTo(
              """
      |import com.Bar
      |import com.Foo
      |
      |fun f() {}
      |
      |fun f() {}
      |
      |class C {}
      |
      |class C {}
      |
      |val x = Foo()
      |
      |val x = Bar()
      |"""
                  .trimMargin())

  @Test
  fun `at least one newline between any adjacent top-level elements, unless it's a property`() =
      assertThatFormatting(
              """
      |import com.Bar
      |import com.Foo
      |fun f() {}
      |fun f() {}
      |class C {}
      |class C {}
      |val x = Foo()
      |val x = Bar()
      |"""
                  .trimMargin())
          .isEqualTo(
              """
      |import com.Bar
      |import com.Foo
      |
      |fun f() {}
      |
      |fun f() {}
      |
      |class C {}
      |
      |class C {}
      |
      |val x = Foo()
      |val x = Bar()
      |"""
                  .trimMargin())

  @Test
  fun `handle array of annotations with field prefix`() {
    val code: String =
        """
    |class MyClass {
    |  @field:[JvmStatic Volatile]
    |  var myVar: String? = null
    |}
    |
    """
            .trimMargin()
    assertThatFormatting(code).isEqualTo(code)
  }

  @Test
  fun `handle array of annotations without field prefix`() {
    val code: String =
        """
    |class MyClass {
    |  @[JvmStatic Volatile]
    |  var myVar: String? = null
    |}
    |
    """
            .trimMargin()
    assertThatFormatting(code).isEqualTo(code)
  }

  // Regression test against https://github.com/facebook/ktfmt/issues/243
  @Test
  fun `regression test against Issue 243`() {
    val code =
        """
      |class Foo {
      |  companion object {
      |    var instance: Foo? = null
      |
      |    fun getInstance() {
      |      return instance ?: synchronized(Foo::class) {
      |        Foo().also { instance = it }
      |      }
      |    }
      |  }
      |}
      |"""
            .trimMargin()

    // Don't throw.
    Formatter.format(code)
  }

  @Test
  fun `lambda with required arrow`() =
      assertFormatted(
          """
      |val a = { x: Int -> }
      |val b = { x: Int -> 0 }
      |val c = { x: Int ->
      |  val y = 0
      |  y
      |}
      |"""
              .trimMargin())

  @Test
  fun `lambda with optional arrow`() =
      assertFormatted(
          """
      |val a = { -> }
      |val b = { -> 0 }
      |val c = { ->
      |  val y = 0
      |  y
      |}
      |"""
              .trimMargin())

  @Test
  fun `lambda missing optional arrow`() =
      assertFormatted(
          """
      |val a = {}
      |val b = { 0 }
      |val c = {
      |  val y = 0
      |  y
      |}
      |"""
              .trimMargin())

  @Test
  fun `lambda with only comments`() {
    assertFormatted(
        """
        |val a = { /* do nothing */ }
        |val b = { /* do nothing */ /* also do nothing */ }
        |val c = { -> /* do nothing */ }
        |val d = { _ -> /* do nothing */ }
        |private val e = Runnable {
        |  // do nothing
        |}
        |private val f: () -> Unit = {
        |  // no-op
        |}
        |private val g: () -> Unit = { /* no-op */ }
        |"""
            .trimMargin())

    assertFormatted(
        """
        |//////////////////////////////
        |val a = { /* do nothing */ }
        |val b =
        |    { /* do nothing */ /* also do nothing */
        |    }
        |val c = { -> /* do nothing */
        |}
        |val d =
        |    { _ -> /* do nothing */
        |    }
        |private val e = Runnable {
        |  // do nothing
        |}
        |private val f: () -> Unit = {
        |  // no-op
        |}
        |private val g: () -> Unit =
        |    { /* no-op */
        |    }
        |"""
            .trimMargin(),
        deduceMaxWidth = true)
  }

  @Test
  fun `lambda block with single and multiple statements`() =
      assertFormatted(
          """
      |private val a = Runnable {
      |  foo()
      |  TODO("implement me")
      |}
      |
      |private val b = Runnable { TODO("implement me") }
      |
      |private val c: () -> Unit = {
      |  foo()
      |  TODO("implement me")
      |}
      |
      |private val d: () -> Unit = { TODO("implement me") }
      |"""
              .trimMargin())

  @Test
  fun `lambda block with comments and statements mix`() =
      assertFormatted(
          """
      |private val a = Runnable {
      |  // no-op
      |  TODO("implement me")
      |}
      |
      |private val b = Runnable {
      |  TODO("implement me")
      |  // no-op
      |}
      |
      |private val c: () -> Unit = {
      |  /* no-op */ TODO("implement me")
      |}
      |
      |private val d: () -> Unit = { ->
      |  /* no-op */ TODO("implement me")
      |}
      |
      |private val e: (String, Int) -> Unit = { _, i -> foo(i) /* do nothing ... */ }
      |"""
              .trimMargin())

  @Test
  fun `lambda block with comments and with statements have same formatting treatment`() =
      assertFormatted(
          """
      |private val a = Runnable { /* no-op */ }
      |private val A = Runnable { TODO("...") }
      |
      |private val b = Runnable {
      |  /* no-op 1 */
      |  /* no-op 2 */
      |}
      |private val B = Runnable {
      |  TODO("no-op")
      |  TODO("no-op")
      |}
      |
      |private val c: () -> Unit = {
      |  /* no-op */
      |}
      |private val C: () -> Unit = { TODO("...") }
      |
      |private val d: () -> Unit = {
      |  /*.*/
      |  /* do nothing ... */
      |}
      |private val D: () -> Unit = {
      |  foo()
      |  TODO("implement me")
      |}
      |"""
              .trimMargin())

  @Test
  fun `last parameter with comment and with statements have same formatting treatment`() {
    assertFormatted(
        """
        |private val a =
        |    call(param) {
        |      // no-op
        |      /* comment */
        |    }
        |private val A =
        |    call(param) {
        |      a.run()
        |      TODO("implement me")
        |    }
        |
        |private val b = call(param) { /* no-op */ }
        |private val B = call(param) { TODO("implement me") }
        |
        |private val c = firstCall().prop.call(param) { /* no-op */ }
        |private val C = firstCall().prop.call(param) { TODO("implement me") }
        |"""
            .trimMargin())

    assertFormatted(
        """
        |////////////////////////////////////////
        |private val a =
        |    firstCall().prop.call(
        |        mySuperInterestingParameter) {
        |          /* no-op */
        |        }
        |private val A =
        |    firstCall().prop.call(
        |        mySuperInterestingParameter) {
        |          TODO("...")
        |        }
        |
        |fun b() {
        |  myProp.funCall(param) { /* 12345 */ }
        |  myProp.funCall(param) { TODO("123") }
        |
        |  myProp.funCall(param) { /* 123456 */ }
        |  myProp.funCall(param) { TODO("1234") }
        |
        |  myProp.funCall(param) { /* 1234567 */
        |  }
        |  myProp.funCall(param) {
        |    TODO("12345")
        |  }
        |
        |  myProp.funCall(param) { /* 12345678 */
        |  }
        |  myProp.funCall(param) {
        |    TODO("123456")
        |  }
        |
        |  myProp.funCall(
        |      param) { /* 123456789 */
        |      }
        |  myProp.funCall(param) {
        |    TODO("1234567")
        |  }
        |
        |  myProp.funCall(
        |      param) { /* very_very_long_comment_that_should_go_on_its_own_line */
        |      }
        |  myProp.funCall(param) {
        |    TODO(
        |        "_a_very_long_comment_that_should_go_on_its_own_line")
        |  }
        |}
        |
        |private val c =
        |    firstCall().prop.call(param) {
        |      /* no-op */
        |    }
        |private val C =
        |    firstCall().prop.call(param) {
        |      TODO("...")
        |    }
        |"""
            .trimMargin(),
        deduceMaxWidth = true)
  }

  @Test
  fun `chaining - many dereferences`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, fit on one line`() =
      assertFormatted(
          """
      |///////////////////////////////////////////////////////////////////////////
      |rainbow.red.orange.yellow.green.blue.indigo.violet.cyan.magenta.key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .build()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one invocation at end, fit on one line`() =
      assertFormatted(
          """
      |///////////////////////////////////////////////////////////////////////////
      |rainbow.red.orange.yellow.green.blue.indigo.violet.cyan.magenta.key.build()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, two invocations at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .build()
      |    .shine()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one invocation in the middle`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .shine()
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, two invocations in the middle`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .shine()
      |    .bright()
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one lambda at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .build { it.appear }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one short lambda at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .z { it }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one multiline lambda at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .z {
      |      it
      |      it
      |    }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one short lambda in the middle`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .z { it }
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one multiline lambda in the middle`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .z {
      |      it
      |      it
      |    }
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one multiline lambda in the middle, remainder could fit on one line`() =
      assertFormatted(
          """
      |/////////////////////////////////////////////////////////////////////////////////////////
      |rainbow.red.orange.yellow.green.blue
      |    .z {
      |      it
      |      it
      |    }
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one multiline lambda and two invocations in the middle, remainder could fit on one line`() =
      assertFormatted(
          """
      |/////////////////////////////////////////////////////////////////////////////////////////
      |rainbow.red.orange.yellow.green.blue
      |    .z {
      |      it
      |      it
      |    }
      |    .shine()
      |    .bright()
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one lambda and invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .z { it }
      |    .shine()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one multiline lambda and invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .z {
      |      it
      |      it
      |    }
      |    .shine()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one invocation and lambda at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .shine()
      |    .z { it }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, one short lambda and invocation in the middle`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .z { it }
      |    .shine()
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, invocation and one short lambda in the middle`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .shine()
      |    .z { it }
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with this`() =
      assertFormatted(
          """
      |/////////////////////////
      |this.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with this, one invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |this.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .build()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with super`() =
      assertFormatted(
          """
      |/////////////////////////
      |super.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with super, one invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |super.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .build()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with short variable`() =
      assertFormatted(
          """
      |/////////////////////////
      |z123.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with short variable, one invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |z123.red.orange.yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .build()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with short variable and lambda, invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |z12.z { it }
      |    .red
      |    .orange
      |    .yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .shine()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting with this and lambda, invocation at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |this.z { it }
      |    .red
      |    .orange
      |    .yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |    .shine()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many invocations`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.a().b().c()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many invocations, with multiline lambda at end`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.a().b().c().zz {
      |  it
      |  it
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many dereferences, starting type name`() =
      assertFormatted(
          """
      |/////////////////////////
      |com.sky.Rainbow.red
      |    .orange
      |    .yellow
      |    .green
      |    .blue
      |    .indigo
      |    .violet
      |    .cyan
      |    .magenta
      |    .key
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many invocations, starting with short variable, lambda at end`() =
      assertFormatted(
          """
      |/////////////
      |z12.shine()
      |    .bright()
      |    .z { it }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - start with invocation, lambda at end`() =
      assertFormatted(
          """
      |/////////////////////
      |getRainbow(
      |        aa, bb, cc)
      |    .z { it }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - many invocations, start with lambda`() =
      assertFormatted(
          """
      |/////////////////////
      |z { it }
      |    .shine()
      |    .bright()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining - start with type name, end with invocation`() =
      assertFormatted(
          """
      |/////////////////////////
      |com.sky.Rainbow
      |    .colorFactory
      |    .build()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.z {
      |  it
      |  it
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda with trailing dereferences`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow
      |    .z {
      |      it
      |      it
      |    }
      |    .red
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda with long name`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow
      |    .someLongLambdaName {
      |      it
      |      it
      |    }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda with long name and trailing dereferences`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow
      |    .someLongLambdaName {
      |      it
      |      it
      |    }
      |    .red
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda with prefix`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.z {
      |  it
      |  it
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda with prefix, forced to next line`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .longLambdaName {
      |      it
      |      it
      |    }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline lambda with prefix, forced to next line with another expression`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .key
      |    .longLambdaName {
      |      it
      |      it
      |    }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.shine(
      |    infrared,
      |    ultraviolet,
      |)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments with trailing dereferences`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow
      |    .shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .red
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, forced to next line`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, forced to next line with another expression`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .key
      |    .shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, forced to next line with another expression, with trailing dereferences`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow.red.orange.yellow
      |    .key
      |    .shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .red
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, with trailing invocation`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow
      |    .shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .bright()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, with trailing lambda`() =
      assertFormatted(
          """
      |/////////////////////////
      |rainbow
      |    .shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .z { it }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, prefixed with super, with trailing invocation`() =
      assertFormatted(
          """
      |/////////////////////////
      |super.shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .bright()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - multiline arguments, starting with short variable, with trailing invocation`() =
      assertFormatted(
          """
      |/////////////////////////
      |z12.shine(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .bright()
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - start with multiline arguments`() =
      assertFormatted(
          """
      |/////////////////////////
      |getRainbow(
      |    infrared,
      |    ultraviolet,
      |)
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `chaining (indentation) - start with multiline arguments, with trailing invocation`() =
      assertFormatted(
          """
      |/////////////////////////
      |getRainbow(
      |        infrared,
      |        ultraviolet,
      |    )
      |    .z { it }
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `annotations for expressions`() =
      assertFormatted(
          """
      |fun f() {
      |  var b
      |  @Suppress("UNCHECKED_CAST") b = f(1) as Int
      |  @Suppress("UNCHECKED_CAST")
      |  b = f(1) as Int
      |
      |  @Suppress("UNCHECKED_CAST") b = f(1) to 5
      |  @Suppress("UNCHECKED_CAST")
      |  b = f(1) to 5
      |
      |  @Suppress("UNCHECKED_CAST") f(1) as Int + 5
      |  @Suppress("UNCHECKED_CAST")
      |  f(1) as Int + 5
      |
      |  @Anno1 /* comment */ @Anno2 f(1) as Int
      |}
      |"""
              .trimMargin())

  @Test
  fun `annotations for expressions 2`() {
    val code =
        """
      |fun f() {
      |  @Suppress("UNCHECKED_CAST") f(1 + f(1) as Int)
      |  @Suppress("UNCHECKED_CAST")
      |  f(1 + f(1) as Int)
      |}
      |"""
            .trimMargin()

    val expected =
        """
      |fun f() {
      |  @Suppress("UNCHECKED_CAST") f(1 + f(1) as Int)
      |  @Suppress("UNCHECKED_CAST") f(1 + f(1) as Int)
      |}
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `function call following long multiline string`() =
      assertFormatted(
          """
      |////////////////////////////////
      |fun stringFitsButNotMethod() {
      |  val str1 =
      |      $TQ Some string $TQ
      |          .trimIndent()
      |
      |  val str2 =
      |      $TQ Some string $TQ
      |          .trimIndent(someArg)
      |}
      |
      |fun stringTooLong() {
      |  val str1 =
      |      $TQ
      |      Some very long string that might mess things up
      |      $TQ
      |          .trimIndent()
      |
      |  val str2 =
      |      $TQ
      |      Some very long string that might mess things up
      |      $TQ
      |          .trimIndent(someArg)
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `array-literal in annotation`() =
      assertFormatted(
          """
      |////////////////////////////////
      |@Anno(
      |    array =
      |        [
      |            someItem,
      |            andAnother,
      |            noTrailingComma])
      |class Host
      |
      |@Anno(
      |    array =
      |        [
      |            someItem,
      |            andAnother,
      |            withTrailingComma,
      |        ])
      |class Host
      |
      |@Anno(
      |    array =
      |        [
      |            // Comment
      |            someItem,
      |            // Comment
      |            andAnother,
      |            // Comment
      |            withTrailingComment
      |            // Comment
      |            // Comment
      |            ])
      |class Host
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `force blank line between class members`() {
    val code =
        """
      |class Foo {
      |  val x = 0
      |  fun foo() {}
      |  class Bar {}
      |  enum class Enum {
      |    A {
      |      val x = 0
      |      fun foo() {}
      |    };
      |    abstract fun foo(): Unit
      |  }
      |}
      |"""
            .trimMargin()

    val expected =
        """
      |class Foo {
      |  val x = 0
      |
      |  fun foo() {}
      |
      |  class Bar {}
      |
      |  enum class Enum {
      |    A {
      |      val x = 0
      |
      |      fun foo() {}
      |    };
      |
      |    abstract fun foo(): Unit
      |  }
      |}
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `preserve blank line between class members between properties`() {
    val code =
        """
      |class Foo {
      |  val x = 0
      |  val x = 0
      |
      |  val x = 0
      |}
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(code)
  }

  @Test
  fun `force blank line between class members preserved between properties with accessors`() {
    val code =
        """
      |class Foo {
      |  val _x = 0
      |  val x = 0
      |    private get
      |  val y = 0
      |}
      |
      |class Foo {
      |  val _x = 0
      |  val x = 0
      |    private set
      |  val y = 0
      |}
      |"""
            .trimMargin()

    val expected =
        """
      |class Foo {
      |  val _x = 0
      |  val x = 0
      |    private get
      |
      |  val y = 0
      |}
      |
      |class Foo {
      |  val _x = 0
      |  val x = 0
      |    private set
      |
      |  val y = 0
      |}
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `context receivers`() {
    val code =
        """
      |context(Something)
      |
      |class A {
      |  context(
      |  // Test comment.
      |  Logger, Raise<Error>)
      |
      |  @SomeAnnotation
      |
      |  fun doNothing() {}
      |
      |  context(SomethingElse)
      |
      |  private class NestedClass {}
      |
      |  fun <T> testSuspend(
      |    mock: T,
      |    block: suspend context(SomeContext) T.() -> Unit,
      |  ) = startCoroutine {
      |    T.block()
      |  }
      |}
      |"""
            .trimMargin()

    val expected =
        """
      |context(Something)
      |class A {
      |  context(
      |  // Test comment.
      |  Logger,
      |  Raise<Error>)
      |  @SomeAnnotation
      |  fun doNothing() {}
      |
      |  context(SomethingElse)
      |  private class NestedClass {}
      |
      |  fun <T> testSuspend(
      |      mock: T,
      |      block:
      |          suspend context(SomeContext)
      |          T.() -> Unit,
      |  ) = startCoroutine { T.block() }
      |}
      |"""
            .trimMargin()

    assertThatFormatting(code).isEqualTo(expected)
  }

  @Test
  fun `trailing comment after function in class`() =
      assertFormatted(
          """
      |class Host {
      |  fun fooBlock() {
      |    return
      |  } // Trailing after fn
      |  // Hanging after fn
      |
      |  // End of class
      |}
      |
      |class Host {
      |  fun fooExpr() = 0 // Trailing after fn
      |  // Hanging after fn
      |
      |  // End of class
      |}
      |
      |class Host {
      |  constructor() {} // Trailing after fn
      |  // Hanging after fn
      |
      |  // End of class
      |}
      |
      |class Host
      |// Primary constructor
      |constructor() // Trailing after fn
      |  // Hanging after fn
      |{
      |  // End of class
      |}
      |
      |class Host {
      |  fun fooBlock() {
      |    return
      |  }
      |
      |  // Between elements
      |
      |  fun fooExpr() = 0
      |
      |  // Between elements
      |
      |  fun fooBlock() {
      |    return
      |  }
      |}
      |"""
              .trimMargin())

  @Test
  fun `trailing comment after function top-level`() {
    assertFormatted(
        """
      |fun fooBlock() {
      |  return
      |} // Trailing after fn
      |// Hanging after fn
      |
      |// End of file
      |"""
            .trimMargin())

    assertFormatted(
        """
      |fun fooExpr() = 0 // Trailing after fn
      |// Hanging after fn
      |
      |// End of file
      |"""
            .trimMargin())

    assertFormatted(
        """
      |fun fooBlock() {
      |  return
      |}
      |
      |// Between elements
      |
      |fun fooExpr() = 0
      |
      |// Between elements
      |
      |fun fooBlock() {
      |  return
      |}
      |"""
            .trimMargin())
  }

  @Test
  fun `line break on base class`() =
      assertFormatted(
          """
      |///////////////////////////
      |class Basket<T>() :
      |    WovenObject {
      |  // some body
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `line break on type specifier`() =
      assertFormatted(
          """
      |///////////////////////////
      |class Basket<T>() where
      |T : Fruit {
      |  // some body
      |}
      |"""
              .trimMargin(),
          deduceMaxWidth = true)

  @Test
  fun `don't crash on empty enum with semicolons`() {
    assertFormatted(
        """
      |///////////////////////////
      |enum class Foo {
      |  ;
      |
      |  fun foo(): Unit
      |}
      |"""
            .trimMargin(),
        deduceMaxWidth = true)

    assertFormatted(
        """
      |///////////////////////////
      |enum class Foo {
      |  ;
      |
      |  companion object Bar
      |}
      |"""
            .trimMargin(),
        deduceMaxWidth = true)

    assertThatFormatting(
            """
      |enum class Foo {
      |  ;
      |  ;
      |  ;
      |
      |  fun foo(): Unit
      |}
      |"""
                .trimMargin())
        .isEqualTo(
            """
      |enum class Foo {
      |  ;
      |
      |  fun foo(): Unit
      |}
      |"""
                .trimMargin())
  }

  @Test
  fun `comment stable test`() {
    // currently unstable
    val first =
        """
        |class Foo { // This is a very long comment that is very long and needs to be line broken because it is long
        |}
        |"""
            .trimMargin()
    val second =
        """
        |class Foo { // This is a very long comment that is very long and needs to be line broken because it
        |            // is long
        |}
        |"""
            .trimMargin()
    val third =
        """
        |class Foo { // This is a very long comment that is very long and needs to be line broken because it
        |  // is long
        |}
        |"""
            .trimMargin()

    assertThatFormatting(first).isEqualTo(second)
    assertThatFormatting(second).isEqualTo(third)
    assertFormatted(third)
  }

  @Test
  fun `comment stable test - no block`() {
    val first =
        """
        |class Fooez // This is a very long comment that is very long and needs to be line broken because it is long
        |"""
            .trimMargin()
    val second =
        """
        |class Fooez // This is a very long comment that is very long and needs to be line broken because it
        |            // is long
        |"""
            .trimMargin()

    assertThatFormatting(first).isEqualTo(second)
    assertFormatted(second)
  }

  @Test
  fun `comment stable test - two blocks`() {
    // currently unstable
    val first =
        """
        |class Fooez // This is a very long comment that is very long and needs to be line broken because it is long
        |class Bar
        |"""
            .trimMargin()
    val second =
        """
        |class Fooez // This is a very long comment that is very long and needs to be line broken because it
        |            // is long
        |
        |class Bar
        |"""
            .trimMargin()
    val third =
        """
        |class Fooez // This is a very long comment that is very long and needs to be line broken because it
        |
        |// is long
        |
        |class Bar
        |"""
            .trimMargin()

    assertThatFormatting(first).isEqualTo(second)
    assertThatFormatting(second).isEqualTo(third)
    assertFormatted(third)
  }

  @Test
  fun `comment stable test - within block`() {
    // currently unstable
    val first =
        """
        |class Foo {
        |  class Bar // This is a very long comment that is very long and needs to be line broken because it is long
        |}
        |"""
            .trimMargin()
    val second =
        """
        |class Foo {
        |  class Bar // This is a very long comment that is very long and needs to be line broken because it
        |            // is long
        |}
        |"""
            .trimMargin()
    val third =
        """
        |class Foo {
        |  class Bar // This is a very long comment that is very long and needs to be line broken because it
        |  // is long
        |}
        |"""
            .trimMargin()

    assertThatFormatting(first).isEqualTo(second)
    assertThatFormatting(second).isEqualTo(third)
    assertFormatted(third)
  }

  companion object {
    /** Triple quotes, useful to use within triple-quoted strings. */
    private const val TQ = "\"\"\""

    @JvmStatic
    @BeforeClass
    fun setUp(): Unit {
      defaultTestFormattingOptions = META_FORMAT.copy(manageTrailingCommas = false)
    }
  }
}