text: /**
   * Copyright 2020 Huawei Technologies Co., Ltd
   *
   * 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 <thread>
  
  #include "common/common_test.h"
  #include "ps/core/count_down_latch.h"
  
  namespace mindspore {
  namespace ps {
  namespace core {
  class TestCountDownLatch : public UT::Common {
   public:
    TestCountDownLatch() = default;
    virtual ~TestCountDownLatch() = default;
  
    void SetUp() override {}
    void TearDown() override {}
  };
  
  TEST_F(TestCountDownLatch, CountDownLatch) {
    CountDownLatch count_down_latch(2);
    ASSERT_EQ(count_down_latch.GetCount(), 2);
    std::thread count_down_thread([&](){
      std::this_thread::sleep_for(std::chrono::seconds(2));
      count_down_latch.CountDown();
      count_down_latch.CountDown();
    });
    count_down_latch.Wait();
    if (count_down_thread.joinable()) {
      count_down_thread.join();
    }
  }
  }  // namespace core
  }  // namespace ps
  }  // namespace mindspore