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.completable;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  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.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.operators.completable.CompletableAmb.Amb;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class CompletableAmbTest extends RxJavaTest {
  
      @Test
      public void ambLots() {
          List<Completable> ms = new ArrayList<>();
  
          for (int i = 0; i < 32; i++) {
              ms.add(Completable.never());
          }
  
          ms.add(Completable.complete());
  
          Completable.amb(ms)
          .test()
          .assertResult();
      }
  
      @Test
      public void ambFirstDone() {
          Completable.amb(Arrays.asList(Completable.complete(), Completable.complete()))
          .test()
          .assertResult();
      }
  
      @Test
      public void dispose() {
          PublishProcessor<Integer> pp1 = PublishProcessor.create();
          PublishProcessor<Integer> pp2 = PublishProcessor.create();
  
          TestObserver<Void> to = Completable.amb(Arrays.asList(pp1.ignoreElements(), pp2.ignoreElements()))
          .test();
  
          assertTrue(pp1.hasSubscribers());
          assertTrue(pp2.hasSubscribers());
  
          to.dispose();
  
          assertFalse(pp1.hasSubscribers());
          assertFalse(pp2.hasSubscribers());
      }
  
      @Test
      public void innerErrorRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              List<Throwable> errors = TestHelper.trackPluginErrors();
              try {
                  final PublishProcessor<Integer> pp0 = PublishProcessor.create();
                  final PublishProcessor<Integer> pp1 = PublishProcessor.create();
  
                  final TestObserver<Void> to = Completable.amb(Arrays.asList(pp0.ignoreElements(), pp1.ignoreElements()))
                  .test();
  
                  final TestException ex = new TestException();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          pp0.onError(ex);
                      }
                  };
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          pp1.onError(ex);
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  to.assertFailure(TestException.class);
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void nullSourceSuccessRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              List<Throwable> errors = TestHelper.trackPluginErrors();
  
              try {
  
                  final Subject<Integer> ps = ReplaySubject.create();
                  ps.onNext(1);
  
                  final Completable source = Completable.ambArray(ps.ignoreElements(), Completable.never(), Completable.never(), null);
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          source.test();
                      }
                  };
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          ps.onComplete();
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertError(errors, 0, NullPointerException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void ambWithOrder() {
          Completable error = Completable.error(new RuntimeException());
          Completable.complete().ambWith(error).test().assertComplete();
      }
  
      @Test
      public void ambIterableOrder() {
          Completable error = Completable.error(new RuntimeException());
          Completable.amb(Arrays.asList(Completable.complete(), error)).test().assertComplete();
      }
  
      @Test
      public void ambArrayOrder() {
          Completable error = Completable.error(new RuntimeException());
          Completable.ambArray(Completable.complete(), error).test().assertComplete();
      }
  
      @Test
      public void ambRace() {
          TestObserver<Void> to = new TestObserver<>();
          to.onSubscribe(Disposable.empty());
  
          CompositeDisposable cd = new CompositeDisposable();
          AtomicBoolean once = new AtomicBoolean();
          Amb a = new Amb(once, cd, to);
          a.onSubscribe(Disposable.empty());
  
          a.onComplete();
          a.onComplete();
  
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              a.onError(new TestException());
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void untilCompletableMainComplete() {
          CompletableSubject main = CompletableSubject.create();
          CompletableSubject other = CompletableSubject.create();
  
          TestObserver<Void> to = main.ambWith(other).test();
  
          assertTrue("Main no observers?", main.hasObservers());
          assertTrue("Other no observers?", other.hasObservers());
  
          main.onComplete();
  
          assertFalse("Main has observers?", main.hasObservers());
          assertFalse("Other has observers?", other.hasObservers());
  
          to.assertResult();
      }
  
      @Test
      public void untilCompletableMainError() {
          CompletableSubject main = CompletableSubject.create();
          CompletableSubject other = CompletableSubject.create();
  
          TestObserver<Void> to = main.ambWith(other).test();
  
          assertTrue("Main no observers?", main.hasObservers());
          assertTrue("Other no observers?", other.hasObservers());
  
          main.onError(new TestException());
  
          assertFalse("Main has observers?", main.hasObservers());
          assertFalse("Other has observers?", other.hasObservers());
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void untilCompletableOtherOnComplete() {
          CompletableSubject main = CompletableSubject.create();
          CompletableSubject other = CompletableSubject.create();
  
          TestObserver<Void> to = main.ambWith(other).test();
  
          assertTrue("Main no observers?", main.hasObservers());
          assertTrue("Other no observers?", other.hasObservers());
  
          other.onComplete();
  
          assertFalse("Main has observers?", main.hasObservers());
          assertFalse("Other has observers?", other.hasObservers());
  
          to.assertResult();
      }
  
      @Test
      public void untilCompletableOtherError() {
          CompletableSubject main = CompletableSubject.create();
          CompletableSubject other = CompletableSubject.create();
  
          TestObserver<Void> to = main.ambWith(other).test();
  
          assertTrue("Main no observers?", main.hasObservers());
          assertTrue("Other no observers?", other.hasObservers());
  
          other.onError(new TestException());
  
          assertFalse("Main has observers?", main.hasObservers());
          assertFalse("Other has observers?", other.hasObservers());
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void noWinnerErrorDispose() throws Exception {
          final TestException ex = new TestException();
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              final AtomicBoolean interrupted = new AtomicBoolean();
              final CountDownLatch cdl = new CountDownLatch(1);
  
              Completable.ambArray(
                      Completable.error(ex)
                      .subscribeOn(Schedulers.single())
                      .observeOn(Schedulers.computation()),
                      Completable.never()
              )
              .subscribe(Functions.EMPTY_ACTION, new Consumer<Throwable>() {
                  @Override
                  public void accept(Throwable e) throws Exception {
                      interrupted.set(Thread.currentThread().isInterrupted());
                      cdl.countDown();
                  }
              });
  
              assertTrue(cdl.await(500, TimeUnit.SECONDS));
              assertFalse("Interrupted!", interrupted.get());
          }
      }
  
      @Test
      public void noWinnerCompleteDispose() throws Exception {
          for (int i = 0; i < TestHelper.RACE_LONG_LOOPS; i++) {
              final AtomicBoolean interrupted = new AtomicBoolean();
              final CountDownLatch cdl = new CountDownLatch(1);
  
              Completable.ambArray(
                  Completable.complete()
                      .subscribeOn(Schedulers.single())
                      .observeOn(Schedulers.computation()),
                  Completable.never()
              )
              .subscribe(new Action() {
                  @Override
                  public void run() throws Exception {
                      interrupted.set(Thread.currentThread().isInterrupted());
                      cdl.countDown();
                  }
              });
  
              assertTrue(cdl.await(500, TimeUnit.SECONDS));
              assertFalse("Interrupted!", interrupted.get());
          }
      }
  
      @Test
      public void completableSourcesInIterable() {
          CompletableSource source = new CompletableSource() {
              @Override
              public void subscribe(CompletableObserver observer) {
                  Completable.complete().subscribe(observer);
              }
          };
  
          Completable.amb(Arrays.asList(source, source))
          .test()
          .assertResult();
      }
  }
  