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.observable;
  
  import java.lang.ref.WeakReference;
  
  import org.junit.*;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableDetachTest extends RxJavaTest {
  
      Object o;
  
      @Test
      public void just() throws Exception {
          o = new Object();
  
          WeakReference<Object> wr = new WeakReference<>(o);
  
          TestObserver<Object> to = new TestObserver<>();
  
          Observable.just(o).count().toObservable().onTerminateDetach().subscribe(to);
  
          to.assertValue(1L);
          to.assertComplete();
          to.assertNoErrors();
  
          o = null;
  
          System.gc();
          Thread.sleep(200);
  
          Assert.assertNull("Object retained!", wr.get());
  
      }
  
      @Test
      public void error() {
          TestObserver<Object> to = new TestObserver<>();
  
          Observable.error(new TestException()).onTerminateDetach().subscribe(to);
  
          to.assertNoValues();
          to.assertError(TestException.class);
          to.assertNotComplete();
      }
  
      @Test
      public void empty() {
          TestObserver<Object> to = new TestObserver<>();
  
          Observable.empty().onTerminateDetach().subscribe(to);
  
          to.assertNoValues();
          to.assertNoErrors();
          to.assertComplete();
      }
  
      @Test
      public void range() {
          TestObserver<Object> to = new TestObserver<>();
  
          Observable.range(1, 1000).onTerminateDetach().subscribe(to);
  
          to.assertValueCount(1000);
          to.assertNoErrors();
          to.assertComplete();
      }
  
      @Test
      public void justUnsubscribed() throws Exception {
          o = new Object();
  
          WeakReference<Object> wr = new WeakReference<>(o);
  
          TestObserver<Long> to = Observable.just(o).count().toObservable().onTerminateDetach().test();
  
          o = null;
          to.dispose();
  
          System.gc();
          Thread.sleep(200);
  
          Assert.assertNull("Object retained!", wr.get());
  
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Observable.never().onTerminateDetach());
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
              @Override
              public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
                  return o.onTerminateDetach();
              }
          });
      }
  }
  