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.assertNull;
  
  import java.io.IOException;
  import java.lang.ref.WeakReference;
  
  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.Function;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeDetachTest extends RxJavaTest {
  
      @Test
      public void doubleSubscribe() {
  
          TestHelper.checkDoubleOnSubscribeMaybe(new Function<Maybe<Object>, MaybeSource<Object>>() {
              @Override
              public MaybeSource<Object> apply(Maybe<Object> m) throws Exception {
                  return m.onTerminateDetach();
              }
          });
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(PublishProcessor.create().singleElement().onTerminateDetach());
      }
  
      @Test
      public void onError() {
          Maybe.error(new TestException())
          .onTerminateDetach()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void onComplete() {
          Maybe.empty()
          .onTerminateDetach()
          .test()
          .assertResult();
      }
  
      @Test
      public void cancelDetaches() throws Exception {
          Disposable d = Disposable.empty();
          final WeakReference<Disposable> wr = new WeakReference<>(d);
  
          TestObserver<Object> to = new Maybe<Object>() {
              @Override
              protected void subscribeActual(MaybeObserver<? super Object> observer) {
                  observer.onSubscribe(wr.get());
              };
          }
          .onTerminateDetach()
          .test();
  
          d = null;
  
          to.dispose();
  
          System.gc();
          Thread.sleep(200);
  
          to.assertEmpty();
  
          assertNull(wr.get());
      }
  
      @Test
      public void completeDetaches() throws Exception {
          Disposable d = Disposable.empty();
          final WeakReference<Disposable> wr = new WeakReference<>(d);
  
          TestObserver<Integer> to = new Maybe<Integer>() {
              @Override
              protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                  observer.onSubscribe(wr.get());
                  observer.onComplete();
                  observer.onComplete();
              };
          }
          .onTerminateDetach()
          .test();
  
          d = null;
  
          System.gc();
          Thread.sleep(200);
  
          to.assertResult();
  
          assertNull(wr.get());
      }
  
      @Test
      public void errorDetaches() throws Exception {
          Disposable d = Disposable.empty();
          final WeakReference<Disposable> wr = new WeakReference<>(d);
  
          TestObserver<Integer> to = new Maybe<Integer>() {
              @Override
              protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                  observer.onSubscribe(wr.get());
                  observer.onError(new TestException());
                  observer.onError(new IOException());
              };
          }
          .onTerminateDetach()
          .test();
  
          d = null;
  
          System.gc();
          Thread.sleep(200);
  
          to.assertFailure(TestException.class);
  
          assertNull(wr.get());
      }
  
      @Test
      public void successDetaches() throws Exception {
          Disposable d = Disposable.empty();
          final WeakReference<Disposable> wr = new WeakReference<>(d);
  
          TestObserver<Integer> to = new Maybe<Integer>() {
              @Override
              protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                  observer.onSubscribe(wr.get());
                  observer.onSuccess(1);
                  observer.onSuccess(2);
              };
          }
          .onTerminateDetach()
          .test();
  
          d = null;
  
          System.gc();
          Thread.sleep(200);
  
          to.assertResult(1);
  
          assertNull(wr.get());
      }
  }
  