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.internal.operators.observable;
  
  import static org.junit.Assert.assertTrue;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableConcatMapCompletableTest extends RxJavaTest {
  
      @Test
      public void asyncFused() throws Exception {
          UnicastSubject<Integer> us = UnicastSubject.create();
  
          TestObserver<Void> to = us.concatMapCompletable(completableComplete(), 2).test();
  
          us.onNext(1);
          us.onComplete();
  
          to.assertComplete();
          to.assertValueCount(0);
      }
  
      @Test
      public void notFused() throws Exception {
          UnicastSubject<Integer> us = UnicastSubject.create();
          TestObserver<Void> to = us.hide().concatMapCompletable(completableComplete(), 2).test();
  
          us.onNext(1);
          us.onNext(2);
          us.onComplete();
  
          to.assertComplete();
          to.assertValueCount(0);
          to.assertNoErrors();
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Observable.<Integer>just(1).hide()
          .concatMapCompletable(completableError()));
      }
  
      @Test
      public void mainError() {
          Observable.<Integer>error(new TestException())
          .concatMapCompletable(completableComplete())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void innerError() {
          Observable.<Integer>just(1).hide()
          .concatMapCompletable(completableError())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void badSource() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Observable<Integer>() {
                  @Override
                  protected void subscribeActual(Observer<? super Integer> observer) {
                      observer.onSubscribe(Disposable.empty());
  
                      observer.onNext(1);
                      observer.onComplete();
                      observer.onNext(2);
                      observer.onError(new TestException());
                      observer.onComplete();
                  }
              }
              .concatMapCompletable(completableComplete())
              .test()
              .assertComplete();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void onErrorRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              List<Throwable> errors = TestHelper.trackPluginErrors();
              try {
                  final PublishSubject<Integer> ps1 = PublishSubject.create();
                  final PublishSubject<Integer> ps2 = PublishSubject.create();
  
                  TestObserver<Void> to = ps1.concatMapCompletable(new Function<Integer, CompletableSource>() {
                      @Override
                      public CompletableSource apply(Integer v) throws Exception {
                          return Completable.fromObservable(ps2);
                      }
                  }).test();
  
                  final TestException ex1 = new TestException();
                  final TestException ex2 = new TestException();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          ps1.onError(ex1);
                      }
                  };
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          ps2.onError(ex2);
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  to.assertFailure(TestException.class);
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertError(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void mapperThrows() {
          Observable.just(1).hide()
          .concatMapCompletable(completableThrows())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void fusedPollThrows() {
          Observable.just(1)
          .map(new Function<Integer, Integer>() {
              @Override
              public Integer apply(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .concatMapCompletable(completableComplete())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void concatReportsDisposedOnComplete() {
          final Disposable[] disposable = { null };
  
          Observable.just(1)
          .hide()
          .concatMapCompletable(completableComplete())
          .subscribe(new CompletableObserver() {
  
              @Override
              public void onSubscribe(Disposable d) {
                  disposable[0] = d;
              }
  
              @Override
              public void onError(Throwable e) {
              }
  
              @Override
              public void onComplete() {
              }
          });
  
          assertTrue(disposable[0].isDisposed());
      }
  
      @Test
      public void concatReportsDisposedOnError() {
          final Disposable[] disposable = { null };
  
          Observable.just(1)
          .hide()
          .concatMapCompletable(completableError())
          .subscribe(new CompletableObserver() {
  
              @Override
              public void onSubscribe(Disposable d) {
                  disposable[0] = d;
              }
  
              @Override
              public void onError(Throwable e) {
              }
  
              @Override
              public void onComplete() {
              }
          });
  
          assertTrue(disposable[0].isDisposed());
      }
  
      private Function<Integer, CompletableSource> completableComplete() {
          return new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  return Completable.complete();
              }
          };
      }
  
      private Function<Integer, CompletableSource> completableError() {
          return new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  return Completable.error(new TestException());
              }
          };
      }
  
      private Function<Integer, CompletableSource> completableThrows() {
          return new Function<Integer, CompletableSource>() {
              @Override
              public CompletableSource apply(Integer v) throws Exception {
                  throw new TestException();
              }
          };
      }
  }
  