1 // Copyright 2021 gRPC authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "src/core/lib/promise/context.h"
16
17 #include <memory>
18
19 #include "gtest/gtest.h"
20
21 namespace grpc_core {
22
23 struct TestContext {
24 bool done = false;
25 };
26
27 template <>
28 struct ContextType<TestContext> {};
29
TEST(Context,WithContext)30 TEST(Context, WithContext) {
31 EXPECT_FALSE(HasContext<TestContext>());
32 TestContext test;
33 EXPECT_FALSE(HasContext<TestContext>());
34 EXPECT_FALSE(test.done);
35 WithContext(
36 []() {
37 EXPECT_TRUE(HasContext<TestContext>());
38 GetContext<TestContext>()->done = true;
39 },
40 &test)();
41 EXPECT_FALSE(HasContext<TestContext>());
42 EXPECT_TRUE(test.done);
43 }
44
45 class BaseContext {
46 public:
47 virtual int Answer() = 0;
48
49 protected:
50 ~BaseContext() = default;
51 };
52
53 class CorrectContext final : public BaseContext {
54 public:
Answer()55 int Answer() override { return 42; }
56 };
57
58 class IncorrectContext final : public BaseContext {
59 public:
Answer()60 int Answer() override { return 0; }
61 };
62
63 template <>
64 struct ContextType<BaseContext> {};
65 template <>
66 struct ContextSubclass<CorrectContext> {
67 using Base = BaseContext;
68 };
69 template <>
70 struct ContextSubclass<IncorrectContext> {
71 using Base = BaseContext;
72 };
73
TEST(Context,ContextSubclass)74 TEST(Context, ContextSubclass) {
75 CorrectContext correct;
76 IncorrectContext incorrect;
77 EXPECT_EQ(42,
78 WithContext([]() { return GetContext<BaseContext>()->Answer(); },
79 &correct)());
80 EXPECT_EQ(0, WithContext([]() { return GetContext<BaseContext>()->Answer(); },
81 &incorrect)());
82 }
83
84 } // namespace grpc_core
85
main(int argc,char ** argv)86 int main(int argc, char** argv) {
87 ::testing::InitGoogleTest(&argc, argv);
88 return RUN_ALL_TESTS();
89 }
90