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.*;
  
  import java.util.List;
  
  import io.reactivex.rxjava3.disposables.Disposable;
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class MaybePeekTest extends RxJavaTest {
  
      @Test
      public void disposed() {
          TestHelper.checkDisposed(PublishProcessor.create().singleElement().doOnSuccess(Functions.emptyConsumer()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeMaybe(new Function<Maybe<Object>, MaybeSource<Object>>() {
              @Override
              public MaybeSource<Object> apply(Maybe<Object> m) throws Exception {
                  return m.doOnSuccess(Functions.emptyConsumer());
              }
          });
      }
  
      @Test
      public void doubleError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          final Throwable[] err = { null };
  
          try {
              TestObserverEx<Integer> to = new Maybe<Integer>() {
                  @Override
                  protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                      observer.onSubscribe(Disposable.empty());
                      observer.onError(new TestException("First"));
                      observer.onError(new TestException("Second"));
                  }
              }
              .doOnError(new Consumer<Throwable>() {
                  @Override
                  public void accept(Throwable e) throws Exception {
                      err[0] = e;
                  }
              })
              .to(TestHelper.<Integer>testConsumer());
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "Second");
  
              assertTrue("" + err, err[0] instanceof TestException);
              assertEquals("First", err[0].getMessage());
  
              to.assertFailureAndMessage(TestException.class, "First");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void doubleComplete() {
          final int[] compl = { 0 };
  
          TestObserver<Integer> to = new Maybe<Integer>() {
              @Override
              protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                  observer.onSubscribe(Disposable.empty());
                  observer.onComplete();
                  observer.onComplete();
              }
          }
          .doOnComplete(new Action() {
              @Override
              public void run() throws Exception {
                  compl[0]++;
              }
          })
          .test();
  
          assertEquals(1, compl[0]);
  
          to.assertResult();
      }
  
      @Test
      public void doOnErrorThrows() {
          TestObserverEx<Object> to = Maybe.error(new TestException("Main"))
          .doOnError(new Consumer<Object>() {
              @Override
              public void accept(Object t) throws Exception {
                  throw new TestException("Inner");
              }
          })
          .to(TestHelper.<Object>testConsumer());
  
          to.assertFailure(CompositeException.class);
  
          List<Throwable> errors = TestHelper.compositeList(to.errors().get(0));
  
          TestHelper.assertError(errors, 0, TestException.class, "Main");
          TestHelper.assertError(errors, 1, TestException.class, "Inner");
      }
  
      @Test
      public void afterTerminateThrows() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          try {
  
              Maybe.just(1)
              .doAfterTerminate(new Action() {
                  @Override
                  public void run() throws Exception {
                      throw new TestException();
                  }
              })
              .test()
              .assertResult(1);
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  