content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  package org.apache.beam.sdk.fn.stream;
  
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.verifyNoMoreInteractions;
  
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.ClientCallStreamObserver;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.ClientResponseObserver;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.StreamObserver;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ForwardingClientResponseObserver}. */
  @RunWith(JUnit4.class)
  public class ForwardingClientResponseObserverTest {
    @Test
    public void testCallsAreForwardedAndOnReadyHandlerBoundSuccess() {
      @SuppressWarnings("unchecked")
      StreamObserver<Object> delegateObserver = mock(StreamObserver.class);
      @SuppressWarnings("unchecked")
      ClientCallStreamObserver<Object> callStreamObserver = mock(ClientCallStreamObserver.class);
      Runnable onReadyHandler = () -> {};
      ClientResponseObserver<Object, Object> observer =
          ForwardingClientResponseObserver.create(delegateObserver, onReadyHandler);
      observer.onNext("A");
      verify(delegateObserver).onNext("A");
      observer.onCompleted();
      verify(delegateObserver).onCompleted();
      observer.beforeStart(callStreamObserver);
      verify(callStreamObserver).setOnReadyHandler(onReadyHandler);
      verifyNoMoreInteractions(delegateObserver, callStreamObserver);
    }
  
    @Test
    public void testCallsAreForwardedAndOnReadyHandlerBoundSuccessWithDoneHandler() {
      @SuppressWarnings("unchecked")
      StreamObserver<Object> delegateObserver = mock(StreamObserver.class);
      @SuppressWarnings("unchecked")
      ClientCallStreamObserver<Object> callStreamObserver = mock(ClientCallStreamObserver.class);
      Runnable onReadyHandler = () -> {};
      Runnable onDoneHandler = mock(Runnable.class);
      ClientResponseObserver<Object, Object> observer =
          ForwardingClientResponseObserver.create(delegateObserver, onReadyHandler, onDoneHandler);
      observer.onNext("A");
      verify(delegateObserver).onNext("A");
      observer.onCompleted();
      verify(delegateObserver).onCompleted();
      observer.beforeStart(callStreamObserver);
      verify(callStreamObserver).setOnReadyHandler(onReadyHandler);
      verifyNoMoreInteractions(delegateObserver, callStreamObserver);
      verify(onDoneHandler).run();
    }
  
    @Test
    public void testCallsAreForwardedAndOnReadyHandlerBoundError() {
      @SuppressWarnings("unchecked")
      StreamObserver<Object> delegateObserver = mock(StreamObserver.class);
      @SuppressWarnings("unchecked")
      ClientCallStreamObserver<Object> callStreamObserver = mock(ClientCallStreamObserver.class);
      Runnable onReadyHandler = () -> {};
      Runnable onDoneHandler = mock(Runnable.class);
      ClientResponseObserver<Object, Object> observer =
          ForwardingClientResponseObserver.create(delegateObserver, onReadyHandler, onDoneHandler);
      observer.onNext("A");
      verify(delegateObserver).onNext("A");
      Throwable t = new RuntimeException();
      observer.onError(t);
      verify(delegateObserver).onError(t);
      observer.beforeStart(callStreamObserver);
      verify(callStreamObserver).setOnReadyHandler(onReadyHandler);
      verifyNoMoreInteractions(delegateObserver, callStreamObserver);
      verify(onDoneHandler).run();
    }
  }
  