text: // 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/map.h"
  
  #include <functional>
  
  #include "gtest/gtest.h"
  
  #include "src/core/lib/promise/promise.h"
  
  namespace grpc_core {
  
  TEST(MapTest, Works) {
    Promise<int> x = Map([]() { return 42; }, [](int i) { return i / 2; });
    EXPECT_EQ(x(), Poll<int>(21));
  }
  
  TEST(MapTest, JustElem) {
    std::tuple<int, double> t(1, 3.2);
    EXPECT_EQ(JustElem<1>()(t), 3.2);
    EXPECT_EQ(JustElem<0>()(t), 1);
  }
  
  }  // namespace grpc_core
  
  int main(int argc, char** argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
  }
  