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.observers;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.internal.util.EndConsumerHelper;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class DisposableCompletableObserverTest extends RxJavaTest {
  
      static final class TestCompletable extends DisposableCompletableObserver {
  
          int start;
  
          int complete;
  
          final List<Throwable> errors = new ArrayList<>();
  
          @Override
          protected void onStart() {
              super.onStart();
  
              start++;
          }
  
          @Override
          public void onComplete() {
              complete++;
          }
  
          @Override
          public void onError(Throwable e) {
              errors.add(e);
          }
  
      }
  
      @Test
      public void normal() {
          TestCompletable tc = new TestCompletable();
  
          assertFalse(tc.isDisposed());
          assertEquals(0, tc.start);
          assertEquals(0, tc.complete);
          assertTrue(tc.errors.isEmpty());
  
          Completable.complete().subscribe(tc);
  
          assertFalse(tc.isDisposed());
          assertEquals(1, tc.start);
          assertEquals(1, tc.complete);
          assertTrue(tc.errors.isEmpty());
      }
  
      @Test
      public void startOnce() {
  
          List<Throwable> error = TestHelper.trackPluginErrors();
  
          try {
              TestCompletable tc = new TestCompletable();
  
              tc.onSubscribe(Disposable.empty());
  
              Disposable d = Disposable.empty();
  
              tc.onSubscribe(d);
  
              assertTrue(d.isDisposed());
  
              assertEquals(1, tc.start);
  
              TestHelper.assertError(error, 0, IllegalStateException.class, EndConsumerHelper.composeMessage(tc.getClass().getName()));
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void dispose() {
          TestCompletable tc = new TestCompletable();
          tc.dispose();
  
          assertTrue(tc.isDisposed());
  
          Disposable d = Disposable.empty();
  
          tc.onSubscribe(d);
  
          assertTrue(d.isDisposed());
  
          assertEquals(0, tc.start);
      }
  }
  