xref: /aosp_15_r20/external/llvm-libc/test/src/time/difftime_test.cpp (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)

//===-- Unittests for difftime --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/__support/FPUtil/FPBits.h"
#include "src/time/difftime.h"
#include "src/time/time_utils.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"

using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
using LIBC_NAMESPACE::time_utils::TimeConstants;

TEST(LlvmLibcDifftime, SmokeTest) {
  time_t t1_seconds = TimeConstants::SECONDS_PER_HOUR;
  time_t t2_seconds = 0;

  LIBC_NAMESPACE::fputil::FPBits<long double> expected_fp =
      LIBC_NAMESPACE::fputil::FPBits<long double>();
  expected_fp = LIBC_NAMESPACE::fputil::FPBits<long double>(
      static_cast<long double>(t1_seconds));

  double result = LIBC_NAMESPACE::difftime(t1_seconds, t2_seconds);

  LIBC_NAMESPACE::fputil::FPBits<long double> actual_fp =
      LIBC_NAMESPACE::fputil::FPBits<long double>();
  actual_fp = LIBC_NAMESPACE::fputil::FPBits<long double>(
      static_cast<long double>(result));

  EXPECT_EQ(actual_fp.uintval(), expected_fp.uintval());
  EXPECT_EQ(actual_fp.is_neg(), expected_fp.is_neg());
  EXPECT_EQ(actual_fp.get_exponent(), expected_fp.get_exponent());
  EXPECT_EQ(actual_fp.get_mantissa(), expected_fp.get_mantissa());
}