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.flowable;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  
  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.functions.Functions;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowableDematerializeTest extends RxJavaTest {
  
      @Test
      public void simpleSelector() {
          Flowable<Notification<Integer>> notifications = Flowable.just(1, 2).materialize();
          Flowable<Integer> dematerialize = notifications.dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          dematerialize.subscribe(subscriber);
  
          verify(subscriber, times(1)).onNext(1);
          verify(subscriber, times(1)).onNext(2);
          verify(subscriber, times(1)).onComplete();
          verify(subscriber, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void selectorCrash() {
          Flowable.just(1, 2)
          .materialize()
          .dematerialize(new Function<Notification<Integer>, Notification<Object>>() {
              @Override
              public Notification<Object> apply(Notification<Integer> v) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void selectorNull() {
          Flowable.just(1, 2)
          .materialize()
          .dematerialize(new Function<Notification<Integer>, Notification<Object>>() {
              @Override
              public Notification<Object> apply(Notification<Integer> v) throws Exception {
                  return null;
              }
          })
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void dematerialize1() {
          Flowable<Notification<Integer>> notifications = Flowable.just(1, 2).materialize();
          Flowable<Integer> dematerialize = notifications.dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          dematerialize.subscribe(subscriber);
  
          verify(subscriber, times(1)).onNext(1);
          verify(subscriber, times(1)).onNext(2);
          verify(subscriber, times(1)).onComplete();
          verify(subscriber, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void dematerialize2() {
          Throwable exception = new Throwable("test");
          Flowable<Integer> flowable = Flowable.error(exception);
          Flowable<Integer> dematerialize = flowable.materialize().dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          dematerialize.subscribe(subscriber);
  
          verify(subscriber, times(1)).onError(exception);
          verify(subscriber, times(0)).onComplete();
          verify(subscriber, times(0)).onNext(any(Integer.class));
      }
  
      @Test
      public void dematerialize3() {
          Exception exception = new Exception("test");
          Flowable<Integer> flowable = Flowable.error(exception);
          Flowable<Integer> dematerialize = flowable.materialize().dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          dematerialize.subscribe(subscriber);
  
          verify(subscriber, times(1)).onError(exception);
          verify(subscriber, times(0)).onComplete();
          verify(subscriber, times(0)).onNext(any(Integer.class));
      }
  
      @Test
      public void errorPassThru() {
          Exception exception = new Exception("test");
          Flowable<Notification<Integer>> flowable = Flowable.error(exception);
          Flowable<Integer> dematerialize = flowable.dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          dematerialize.subscribe(subscriber);
  
          verify(subscriber, times(1)).onError(exception);
          verify(subscriber, times(0)).onComplete();
          verify(subscriber, times(0)).onNext(any(Integer.class));
      }
  
      @Test
      public void completePassThru() {
          Flowable<Notification<Integer>> flowable = Flowable.empty();
          Flowable<Integer> dematerialize = flowable.dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          TestSubscriberEx<Integer> ts = new TestSubscriberEx<>(subscriber);
          dematerialize.subscribe(ts);
  
          System.out.println(ts.errors());
  
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber, times(1)).onComplete();
          verify(subscriber, times(0)).onNext(any(Integer.class));
      }
  
      @Test
      public void honorsContractWhenCompleted() {
          Flowable<Integer> source = Flowable.just(1);
  
          Flowable<Integer> result = source.materialize().dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          result.subscribe(subscriber);
  
          verify(subscriber).onNext(1);
          verify(subscriber).onComplete();
          verify(subscriber, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void honorsContractWhenThrows() {
          Flowable<Integer> source = Flowable.error(new TestException());
  
          Flowable<Integer> result = source.materialize().dematerialize(Functions.<Notification<Integer>>identity());
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          result.subscribe(subscriber);
  
          verify(subscriber, never()).onNext(any(Integer.class));
          verify(subscriber, never()).onComplete();
          verify(subscriber).onError(any(TestException.class));
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Flowable.just(Notification.createOnComplete())
                  .dematerialize(Functions.<Notification<Object>>identity()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Notification<Object>>, Flowable<Object>>() {
              @Override
              public Flowable<Object> apply(Flowable<Notification<Object>> f) throws Exception {
                  return f.dematerialize(Functions.<Notification<Object>>identity());
              }
          });
      }
  
      @Test
      public void eventsAfterDematerializedTerminal() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Flowable<Notification<Object>>() {
                  @Override
                  protected void subscribeActual(Subscriber<? super Notification<Object>> subscriber) {
                      subscriber.onSubscribe(new BooleanSubscription());
                      subscriber.onNext(Notification.createOnComplete());
                      subscriber.onNext(Notification.<Object>createOnNext(1));
                      subscriber.onNext(Notification.createOnError(new TestException("First")));
                      subscriber.onError(new TestException("Second"));
                  }
              }
              .dematerialize(Functions.<Notification<Object>>identity())
              .test()
              .assertResult();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "First");
              TestHelper.assertUndeliverable(errors, 1, TestException.class, "Second");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void notificationInstanceAfterDispose() {
          new Flowable<Notification<Object>>() {
              @Override
              protected void subscribeActual(Subscriber<? super Notification<Object>> subscriber) {
                  subscriber.onSubscribe(new BooleanSubscription());
                  subscriber.onNext(Notification.createOnComplete());
                  subscriber.onNext(Notification.<Object>createOnNext(1));
              }
          }
          .dematerialize(Functions.<Notification<Object>>identity())
          .test()
          .assertResult();
      }
  
      @Test
      @SuppressWarnings("unchecked")
      public void nonNotificationInstanceAfterDispose() {
          new Flowable<Object>() {
              @Override
              protected void subscribeActual(Subscriber<? super Object> subscriber) {
                  subscriber.onSubscribe(new BooleanSubscription());
                  subscriber.onNext(Notification.createOnComplete());
                  subscriber.onNext(1);
              }
          }
          .dematerialize(v -> (Notification<Object>)v)
          .test()
          .assertResult();
      }
  }
  