text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * 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 <folly/Portability.h>
  
  #if FOLLY_HAS_COROUTINES
  
  #include <folly/experimental/coro/Accumulate.h>
  #include <folly/experimental/coro/BlockingWait.h>
  
  #include <folly/portability/GTest.h>
  
  using namespace folly::coro;
  
  namespace {
  
  AsyncGenerator<int> generateInts(int begin, int end) {
    for (int i = begin; i < end; i++) {
      co_await co_reschedule_on_current_executor;
      co_yield i;
    }
  }
  
  } // namespace
  
  TEST(AccumulateTest, NoOperationProvided) {
    auto result = blockingWait(accumulate(generateInts(0, 5), 0));
    auto expected = 0 + 1 + 2 + 3 + 4;
  
    EXPECT_EQ(result, expected);
  }
  
  TEST(AccumulateTest, OperationProvided) {
    auto result =
        blockingWait(accumulate(generateInts(1, 5), 1, std::multiplies{}));
    auto expected = 1 * 2 * 3 * 4;
  
    EXPECT_EQ(result, expected);
  }
  
  #endif
  