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.test;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.concurrent.atomic.AtomicBoolean;
  import org.hamcrest.Matchers;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link TestStreams}. */
  @RunWith(JUnit4.class)
  public class TestStreamsTest {
    @Test
    public void testOnNextIsCalled() {
      final AtomicBoolean onNextWasCalled = new AtomicBoolean();
      TestStreams.withOnNext(onNextWasCalled::set).build().onNext(true);
      assertTrue(onNextWasCalled.get());
    }
  
    @Test
    public void testIsReadyIsCalled() {
      final AtomicBoolean isReadyWasCalled = new AtomicBoolean();
      assertFalse(
          TestStreams.withOnNext(null)
              .withIsReady(() -> isReadyWasCalled.getAndSet(true))
              .build()
              .isReady());
      assertTrue(isReadyWasCalled.get());
    }
  
    @Test
    public void testOnCompletedIsCalled() {
      final AtomicBoolean onCompletedWasCalled = new AtomicBoolean();
      TestStreams.withOnNext(null)
          .withOnCompleted(() -> onCompletedWasCalled.set(true))
          .build()
          .onCompleted();
      assertTrue(onCompletedWasCalled.get());
    }
  
    @Test
    public void testOnErrorRunnableIsCalled() {
      RuntimeException throwable = new RuntimeException();
      final AtomicBoolean onErrorWasCalled = new AtomicBoolean();
      TestStreams.withOnNext(null)
          .withOnError(() -> onErrorWasCalled.set(true))
          .build()
          .onError(throwable);
      assertTrue(onErrorWasCalled.get());
    }
  
    @Test
    public void testOnErrorConsumerIsCalled() {
      RuntimeException throwable = new RuntimeException();
      final Collection<Throwable> onErrorWasCalled = new ArrayList<>();
      TestStreams.withOnNext(null).withOnError(onErrorWasCalled::add).build().onError(throwable);
      assertThat(onErrorWasCalled, Matchers.contains(throwable));
    }
  }
  