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.maybe;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.schedulers.TestScheduler;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeDelaySubscriptionTest extends RxJavaTest {
  
      @Test
      public void normal() {
          PublishProcessor<Object> pp = PublishProcessor.create();
  
          TestObserver<Integer> to = Maybe.just(1).delaySubscription(pp)
          .test();
  
          assertTrue(pp.hasSubscribers());
  
          to.assertEmpty();
  
          pp.onNext("one");
  
          assertFalse(pp.hasSubscribers());
  
          to.assertResult(1);
      }
  
      @Test
      public void timed() {
          Maybe.just(1).delaySubscription(100, TimeUnit.MILLISECONDS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void timedEmpty() {
          Maybe.<Integer>empty().delaySubscription(100, TimeUnit.MILLISECONDS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult();
      }
  
      @Test
      public void timedTestScheduler() {
          TestScheduler scheduler = new TestScheduler();
  
          TestObserver<Integer> to = Maybe.just(1)
          .delaySubscription(100, TimeUnit.MILLISECONDS, scheduler)
          .test();
  
          to.assertEmpty();
  
          scheduler.advanceTimeBy(99, TimeUnit.MILLISECONDS);
  
          to.assertEmpty();
  
          scheduler.advanceTimeBy(1, TimeUnit.MILLISECONDS);
  
          to.assertResult(1);
      }
  
      @Test
      public void otherError() {
          Maybe.just(1).delaySubscription(Flowable.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void mainError() {
          Maybe.error(new TestException())
          .delaySubscription(Flowable.empty())
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void withPublisherDispose() {
          TestHelper.checkDisposed(Maybe.just(1).delaySubscription(Flowable.never()));
      }
  
      @Test
      public void withPublisherDoubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeMaybe(new Function<Maybe<Object>, MaybeSource<Object>>() {
              @Override
              public MaybeSource<Object> apply(Maybe<Object> m) throws Exception {
                  return m.delaySubscription(Flowable.just(1));
              }
          });
      }
  
      @Test
      public void withPublisherCallAfterTerminalEvent() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          try {
              Flowable<Integer> f = new Flowable<Integer>() {
                  @Override
                  protected void subscribeActual(Subscriber<? super Integer> subscriber) {
                      subscriber.onSubscribe(new BooleanSubscription());
                      subscriber.onNext(1);
                      subscriber.onError(new TestException());
                      subscriber.onComplete();
                      subscriber.onNext(2);
                  }
              };
  
              Maybe.just(1).delaySubscription(f)
              .test()
              .assertResult(1);
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void doubleOnSubscribePublisher() {
          TestHelper.checkDoubleOnSubscribeFlowableToMaybe(f -> Maybe.just(1).delaySubscription(f));
      }
  }
  