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.observers;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  
  import io.reactivex.rxjava3.disposables.Disposable;
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Action;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class DisposableLambdaObserverTest extends RxJavaTest {
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.doubleOnSubscribe(new DisposableLambdaObserver<>(
                  new TestObserver<>(), Functions.emptyConsumer(), Functions.EMPTY_ACTION
          ));
      }
  
      @Test
      public void disposeCrash() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              DisposableLambdaObserver<Integer> o = new DisposableLambdaObserver<>(
                      new TestObserver<>(), Functions.emptyConsumer(),
                      new Action() {
                          @Override
                          public void run() throws Exception {
                              throw new TestException();
                          }
                      }
              );
  
              o.onSubscribe(Disposable.empty());
  
              assertFalse(o.isDisposed());
  
              o.dispose();
  
              assertTrue(o.isDisposed());
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  