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.single;
  
  import static io.reactivex.rxjava3.internal.util.ExceptionHelper.timeoutMessage;
  import static org.junit.Assert.*;
  
  import java.util.List;
  import java.util.concurrent.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.annotations.NonNull;
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Action;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.schedulers.*;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class SingleTimeoutTest extends RxJavaTest {
  
      @Test
      public void shouldUnsubscribeFromUnderlyingSubscriptionOnDispose() {
          final PublishSubject<String> subject = PublishSubject.create();
          final TestScheduler scheduler = new TestScheduler();
  
          final TestObserver<String> observer = subject.single("")
                  .timeout(100, TimeUnit.MILLISECONDS, scheduler)
                  .test();
  
          assertTrue(subject.hasObservers());
  
          observer.dispose();
  
          assertFalse(subject.hasObservers());
      }
  
      @Test
      public void otherErrors() {
          Single.never()
          .timeout(1, TimeUnit.MILLISECONDS, Single.error(new TestException()))
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void mainSuccess() {
          Single.just(1)
          .timeout(1, TimeUnit.DAYS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void mainError() {
          Single.error(new TestException())
          .timeout(1, TimeUnit.DAYS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void disposeWhenFallback() {
          TestScheduler sch = new TestScheduler();
  
          SingleSubject<Integer> subj = SingleSubject.create();
  
          subj.timeout(1, TimeUnit.SECONDS, sch, Single.just(1))
          .test(true)
          .assertEmpty();
  
          assertFalse(subj.hasObservers());
      }
  
      @Test
      public void isDisposed() {
          TestHelper.checkDisposed(SingleSubject.create().timeout(1, TimeUnit.DAYS));
      }
  
      @Test
      public void fallbackDispose() {
          TestScheduler sch = new TestScheduler();
  
          SingleSubject<Integer> subj = SingleSubject.create();
  
          SingleSubject<Integer> fallback = SingleSubject.create();
  
          TestObserver<Integer> to = subj.timeout(1, TimeUnit.SECONDS, sch, fallback)
          .test();
  
          assertFalse(fallback.hasObservers());
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          assertFalse(subj.hasObservers());
          assertTrue(fallback.hasObservers());
  
          to.dispose();
  
          assertFalse(fallback.hasObservers());
      }
  
      @Test
      public void normalSuccessDoesntDisposeMain() {
          final int[] calls = { 0 };
  
          Single.just(1)
          .doOnDispose(new Action() {
              @Override
              public void run() throws Exception {
                  calls[0]++;
              }
          })
          .timeout(1, TimeUnit.DAYS)
          .test()
          .assertResult(1);
  
          assertEquals(0, calls[0]);
      }
  
      @Test
      public void successTimeoutRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final SingleSubject<Integer> subj = SingleSubject.create();
              SingleSubject<Integer> fallback = SingleSubject.create();
  
              final TestScheduler sch = new TestScheduler();
  
              TestObserver<Integer> to = subj.timeout(1, TimeUnit.MILLISECONDS, sch, fallback).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      subj.onSuccess(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      sch.advanceTimeBy(1, TimeUnit.MILLISECONDS);
                  }
              };
  
              TestHelper.race(r1, r2);
  
              if (!fallback.hasObservers()) {
                  to.assertResult(1);
              } else {
                  to.assertEmpty();
              }
          }
      }
  
      @Test
      public void errorTimeoutRace() {
          final TestException ex = new TestException();
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
  
              for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
                  final SingleSubject<Integer> subj = SingleSubject.create();
                  SingleSubject<Integer> fallback = SingleSubject.create();
  
                  final TestScheduler sch = new TestScheduler();
  
                  TestObserver<Integer> to = subj.timeout(1, TimeUnit.MILLISECONDS, sch, fallback).test();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          subj.onError(ex);
                      }
                  };
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          sch.advanceTimeBy(1, TimeUnit.MILLISECONDS);
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  if (!fallback.hasObservers()) {
                      to.assertFailure(TestException.class);
                  } else {
                      to.assertEmpty();
                  }
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              }
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void mainTimedOut() {
          Single
                  .never()
                  .timeout(1, TimeUnit.MILLISECONDS)
                  .to(TestHelper.<Object>testConsumer())
                  .awaitDone(5, TimeUnit.SECONDS)
                  .assertFailureAndMessage(TimeoutException.class, timeoutMessage(1, TimeUnit.MILLISECONDS));
      }
  
      @Test
      public void mainTimeoutFallbackSuccess() {
          Single.never()
          .timeout(1, TimeUnit.MILLISECONDS, Single.just(1))
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void timeoutBeforeOnSubscribeFromMain() {
          Disposable d = Disposable.empty();
  
          new Single<Integer>() {
              @Override
              protected void subscribeActual(@NonNull SingleObserver<? super @NonNull Integer> observer) {
                  try {
                      Thread.sleep(100);
                  } catch (InterruptedException e) {
                      e.printStackTrace();
                  }
                  observer.onSubscribe(d);
              }
          }
          .timeout(1, TimeUnit.MILLISECONDS, Single.just(1))
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
  
          assertTrue(d.isDisposed());
      }
  
      @Test
      public void timeoutWithZero() throws InterruptedException {
          int n = 10_000;
          Scheduler sch = Schedulers.single();
          for (int i = 0; i < n; i++) {
              final int y = i;
              final CountDownLatch latch = new CountDownLatch(1);
              Disposable d = Single.never()
                      .timeout(0, TimeUnit.NANOSECONDS, sch)
                      .subscribe(v -> {}, e -> {
                          //System.out.println("timeout " + y);
                          latch.countDown();
                      });
              if (!latch.await(2, TimeUnit.SECONDS)) {
                  System.out.println(d + " " + sch);
                  throw new IllegalStateException("Timeout did not work at y = " + y);
              }
          }
      }
  }
  