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 <wangle/channel/StaticPipeline.h>
  #include <wangle/channel/OutputBufferingHandler.h>
  #include <wangle/channel/test/MockHandler.h>
  #include <folly/io/async/AsyncSocket.h>
  #include <folly/portability/GMock.h>
  #include <folly/portability/GTest.h>
  
  using namespace folly;
  using namespace wangle;
  using namespace testing;
  
  typedef StrictMock<MockHandlerAdapter<
    IOBufQueue&,
    std::unique_ptr<IOBuf>>>
  MockBytesHandler;
  
  MATCHER_P(IOBufContains, str, "") { return arg->moveToFbString() == str; }
  
  TEST(OutputBufferingHandlerTest, Basic) {
    MockBytesHandler mockHandler;
    EXPECT_CALL(mockHandler, attachPipeline(_));
    auto pipeline = StaticPipeline<IOBufQueue&, std::unique_ptr<IOBuf>,
      MockBytesHandler,
      OutputBufferingHandler>::create(
        &mockHandler,
        OutputBufferingHandler());
  
    EventBase eb;
    auto socket = AsyncSocket::newSocket(&eb);
    pipeline->setTransport(std::move(socket));
  
    // Buffering should prevent writes until the EB loops, and the writes should
    // be batched into one write call.
    auto f1 = pipeline->write(IOBuf::copyBuffer("hello"));
    auto f2 = pipeline->write(IOBuf::copyBuffer("world"));
    EXPECT_FALSE(f1.isReady());
    EXPECT_FALSE(f2.isReady());
    EXPECT_CALL(mockHandler, write_(_, IOBufContains("helloworld")));
    eb.loopOnce();
    EXPECT_TRUE(f1.isReady());
    EXPECT_TRUE(f2.isReady());
    EXPECT_CALL(mockHandler, detachPipeline(_));
  
   // Make sure the SharedPromise resets correctly
    auto f = pipeline->write(IOBuf::copyBuffer("foo"));
    EXPECT_FALSE(f.isReady());
    EXPECT_CALL(mockHandler, write_(_, IOBufContains("foo")));
    eb.loopOnce();
    EXPECT_TRUE(f.isReady());
    pipeline.reset();
  }
  