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.assertNotEquals;
  
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.schedulers.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class CompletableDelayTest extends RxJavaTest {
  
      @Test
      public void delayCustomScheduler() {
  
          Completable.complete()
          .delay(100, TimeUnit.MILLISECONDS, Schedulers.trampoline())
          .test()
          .assertResult();
      }
  
      @Test
      public void onErrorCalledOnScheduler() throws Exception {
          final CountDownLatch latch = new CountDownLatch(1);
          final AtomicReference<Thread> thread = new AtomicReference<>();
  
          Completable.error(new Exception())
                  .delay(0, TimeUnit.MILLISECONDS, Schedulers.newThread())
                  .doOnError(new Consumer<Throwable>() {
                      @Override
                      public void accept(Throwable throwable) throws Exception {
                          thread.set(Thread.currentThread());
                          latch.countDown();
                      }
                  })
                  .onErrorComplete()
                  .subscribe();
  
          latch.await();
  
          assertNotEquals(Thread.currentThread(), thread.get());
      }
  
      @Test
      public void disposed() {
          TestHelper.checkDisposed(Completable.never().delay(1, TimeUnit.MINUTES));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeCompletable(new Function<Completable, CompletableSource>() {
              @Override
              public CompletableSource apply(Completable c) throws Exception {
                  return c.delay(1, TimeUnit.MINUTES);
              }
          });
      }
  
      @Test
      public void normal() {
          Completable.complete()
          .delay(1, TimeUnit.MILLISECONDS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult();
      }
  
      @Test
      public void errorNotDelayed() {
          TestScheduler scheduler = new TestScheduler();
  
          TestObserver<Void> to = Completable.error(new TestException())
          .delay(100, TimeUnit.MILLISECONDS, scheduler, false)
          .test();
  
          to.assertEmpty();
  
          scheduler.advanceTimeBy(1, TimeUnit.MILLISECONDS);
  
          to.assertFailure(TestException.class);
  
          scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void errorDelayed() {
          TestScheduler scheduler = new TestScheduler();
  
          TestObserver<Void> to = Completable.error(new TestException())
          .delay(100, TimeUnit.MILLISECONDS, scheduler, true)
          .test();
  
          to.assertEmpty();
  
          scheduler.advanceTimeBy(1, TimeUnit.MILLISECONDS);
  
          to.assertEmpty();
  
          scheduler.advanceTimeBy(99, TimeUnit.MILLISECONDS);
  
          to.assertFailure(TestException.class);
      }
  }
  