code: /*
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * 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.
   */
  
  package io.reactivex.rxjava3.flowable;
  
  import static org.junit.Assert.assertNotNull;
  
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.Test;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subscribers.DefaultSubscriber;
  
  public class FlowableErrorHandlingTests extends RxJavaTest {
  
      /**
       * Test that an error from a user provided Observer.onNext
       * is handled and emitted to the onError.
       * @throws InterruptedException if the test is interrupted
       */
      @Test
      public void onNextError() throws InterruptedException {
          final CountDownLatch latch = new CountDownLatch(1);
          final AtomicReference<Throwable> caughtError = new AtomicReference<>();
          Flowable<Long> f = Flowable.interval(50, TimeUnit.MILLISECONDS);
          Subscriber<Long> subscriber = new DefaultSubscriber<Long>() {
  
              @Override
              public void onComplete() {
                  System.out.println("completed");
                  latch.countDown();
              }
  
              @Override
              public void onError(Throwable e) {
                  System.out.println("error: " + e);
                  caughtError.set(e);
                  latch.countDown();
              }
  
              @Override
              public void onNext(Long args) {
                  throw new RuntimeException("forced failure");
              }
          };
          f.safeSubscribe(subscriber);
  
          latch.await(2000, TimeUnit.MILLISECONDS);
          assertNotNull(caughtError.get());
      }
  
      /**
       * Test that an error from a user provided Observer.onNext
       * is handled and emitted to the onError.
       * even when done across thread boundaries with observeOn
       * @throws InterruptedException if the test is interrupted
       */
      @Test
      public void onNextErrorAcrossThread() throws InterruptedException {
          final CountDownLatch latch = new CountDownLatch(1);
          final AtomicReference<Throwable> caughtError = new AtomicReference<>();
          Flowable<Long> f = Flowable.interval(50, TimeUnit.MILLISECONDS);
          Subscriber<Long> subscriber = new DefaultSubscriber<Long>() {
  
              @Override
              public void onComplete() {
                  System.out.println("completed");
                  latch.countDown();
              }
  
              @Override
              public void onError(Throwable e) {
                  System.out.println("error: " + e);
                  caughtError.set(e);
                  latch.countDown();
              }
  
              @Override
              public void onNext(Long args) {
                  throw new RuntimeException("forced failure");
              }
          };
          f.observeOn(Schedulers.newThread())
          .safeSubscribe(subscriber);
  
          latch.await(2000, TimeUnit.MILLISECONDS);
          assertNotNull(caughtError.get());
      }
  }
  