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.junit.Assert.*;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  
  import org.junit.*;
  import org.mockito.Mockito;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.Action;
  import io.reactivex.rxjava3.internal.util.ExceptionHelper;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableDoAfterTerminateTest extends RxJavaTest {
  
      private Action aAction0;
      private Subscriber<String> subscriber;
  
      @Before
      public void before() {
          aAction0 = Mockito.mock(Action.class);
          subscriber = TestHelper.mockSubscriber();
      }
  
      private void checkActionCalled(Flowable<String> input) {
          input.doAfterTerminate(aAction0).subscribe(subscriber);
          try {
              verify(aAction0, times(1)).run();
          } catch (Throwable ex) {
              throw ExceptionHelper.wrapOrThrow(ex);
          }
      }
  
      @Test
      public void doAfterTerminateCalledOnComplete() {
          checkActionCalled(Flowable.fromArray("1", "2", "3"));
      }
  
      @Test
      public void doAfterTerminateCalledOnError() {
          checkActionCalled(Flowable.<String> error(new RuntimeException("expected")));
      }
  
      @Test
      public void nullActionShouldBeCheckedInConstructor() {
          try {
              Flowable.empty().doAfterTerminate(null);
              fail("Should have thrown NullPointerException");
          } catch (NullPointerException expected) {
              assertEquals("onAfterTerminate is null", expected.getMessage());
          }
      }
  
      @Test
      public void nullFinallyActionShouldBeCheckedASAP() {
          try {
              Flowable
                      .just("value")
                      .doAfterTerminate(null);
  
              fail();
          } catch (NullPointerException expected) {
  
          }
      }
  
      @Test
      public void ifFinallyActionThrowsExceptionShouldNotBeSwallowedAndActionShouldBeCalledOnce() throws Throwable {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Action finallyAction = Mockito.mock(Action.class);
              doThrow(new IllegalStateException()).when(finallyAction).run();
  
              TestSubscriber<String> testSubscriber = new TestSubscriber<>();
  
              Flowable
                      .just("value")
                      .doAfterTerminate(finallyAction)
                      .subscribe(testSubscriber);
  
              testSubscriber.assertValue("value");
  
              verify(finallyAction).run();
  
              TestHelper.assertError(errors, 0, IllegalStateException.class);
              // Actual result:
              // Not only IllegalStateException was swallowed
              // But finallyAction was called twice!
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  