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/promise.h"
16
17 #include <memory>
18 #include <utility>
19
20 #include "gtest/gtest.h"
21
22 namespace grpc_core {
23
TEST(PromiseTest,Works)24 TEST(PromiseTest, Works) {
25 Promise<int> x = []() { return 42; };
26 EXPECT_EQ(x(), Poll<int>(42));
27 }
28
TEST(PromiseTest,Immediate)29 TEST(PromiseTest, Immediate) { EXPECT_EQ(Immediate(42)(), Poll<int>(42)); }
30
TEST(PromiseTest,WithResult)31 TEST(PromiseTest, WithResult) {
32 EXPECT_EQ(WithResult<int>(Immediate(42))(), Poll<int>(42));
33 // Fails to compile: WithResult<int>(Immediate(std::string("hello")));
34 // Fails to compile: WithResult<int>(Immediate(42.9));
35 }
36
TEST(PromiseTest,NowOrNever)37 TEST(PromiseTest, NowOrNever) {
38 EXPECT_EQ(NowOrNever(Immediate(42)), absl::optional<int>(42));
39 }
40
41 } // namespace grpc_core
42
main(int argc,char ** argv)43 int main(int argc, char** argv) {
44 ::testing::InitGoogleTest(&argc, argv);
45 return RUN_ALL_TESTS();
46 }
47