test/core/promise/promise_factory_test.cc

// Copyright 2021 gRPC authors.
//
// 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.

#include "src/core/lib/promise/detail/promise_factory.h"

#include <functional>

#include "absl/functional/bind_front.h"
#include "gtest/gtest.h"

#include "src/core/lib/promise/poll.h"
#include "src/core/lib/promise/promise.h"

namespace grpc_core {
namespace promise_detail {
namespace testing {

template <typename Arg, typename F>
auto MakeOnceFactory(F f) {
  return OncePromiseFactory<Arg, F>(std::move(f));
}
template <typename Arg, typename F>
auto MakeRepeatedFactory(F f) {
  return RepeatedPromiseFactory<Arg, F>(std::move(f));
}

TEST(AdaptorTest, FactoryFromPromise) {
  EXPECT_EQ(
      MakeOnceFactory<void>([]() { return Poll<int>(Poll<int>(42)); }).Make()(),
      Poll<int>(42));
  EXPECT_EQ(MakeRepeatedFactory<void>([]() {
              return Poll<int>(Poll<int>(42));
            }).Make()(),
            Poll<int>(42));
  EXPECT_EQ(MakeOnceFactory<void>(Promise<int>([]() {
              return Poll<int>(Poll<int>(42));
            })).Make()(),
            Poll<int>(42));
  EXPECT_EQ(MakeRepeatedFactory<void>(Promise<int>([]() {
              return Poll<int>(Poll<int>(42));
            })).Make()(),
            Poll<int>(42));
}

TEST(AdaptorTest, FactoryFromBindFrontPromise) {
  EXPECT_EQ(MakeOnceFactory<void>(
                absl::bind_front([](int i) { return Poll<int>(i); }, 42))
                .Make()(),
            Poll<int>(42));
}

}  // namespace testing
}  // namespace promise_detail

}  // namespace grpc_core

int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}