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.single;
  
  import static org.junit.Assert.*;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class SingleDoOnTest extends RxJavaTest {
  
      @Test
      public void doOnDispose() {
          final int[] count = { 0 };
  
          Single.never().doOnDispose(new Action() {
              @Override
              public void run() throws Exception {
                  count[0]++;
              }
          }).test(true);
  
          assertEquals(1, count[0]);
      }
  
      @Test
      public void doOnError() {
          final Object[] event = { null };
  
          Single.error(new TestException()).doOnError(new Consumer<Throwable>() {
              @Override
              public void accept(Throwable e) throws Exception {
                  event[0] = e;
              }
          })
          .test();
  
          assertTrue(event[0].toString(), event[0] instanceof TestException);
      }
  
      @Test
      public void doOnSubscribe() {
          final int[] count = { 0 };
  
          Single.never().doOnSubscribe(new Consumer<Disposable>() {
              @Override
              public void accept(Disposable d) throws Exception {
                  count[0]++;
              }
          }).test();
  
          assertEquals(1, count[0]);
      }
  
      @Test
      public void doOnSuccess() {
          final Object[] event = { null };
  
          Single.just(1).doOnSuccess(new Consumer<Integer>() {
              @Override
              public void accept(Integer e) throws Exception {
                  event[0] = e;
              }
          })
          .test();
  
          assertEquals(1, event[0]);
      }
  
      @Test
      public void doOnSubscribeNormal() {
          final int[] count = { 0 };
  
          Single.just(1).doOnSubscribe(new Consumer<Disposable>() {
              @Override
              public void accept(Disposable d) throws Exception {
                  count[0]++;
              }
          })
          .test()
          .assertResult(1);
  
          assertEquals(1, count[0]);
      }
  
      @Test
      public void doOnSubscribeError() {
          final int[] count = { 0 };
  
          Single.error(new TestException()).doOnSubscribe(new Consumer<Disposable>() {
              @Override
              public void accept(Disposable d) throws Exception {
                  count[0]++;
              }
          })
          .test()
          .assertFailure(TestException.class);
  
          assertEquals(1, count[0]);
      }
  
      @Test
      public void doOnSubscribeJustCrash() {
  
          Single.just(1).doOnSubscribe(new Consumer<Disposable>() {
              @Override
              public void accept(Disposable d) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void doOnSubscribeErrorCrash() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          try {
              Single.error(new TestException("Outer")).doOnSubscribe(new Consumer<Disposable>() {
                  @Override
                  public void accept(Disposable d) throws Exception {
                      throw new TestException("Inner");
                  }
              })
              .to(TestHelper.testConsumer())
              .assertFailureAndMessage(TestException.class, "Inner");
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "Outer");
          } finally {
              RxJavaPlugins.reset();
          }
  
      }
  
      @Test
      public void onErrorSuccess() {
          final int[] call = { 0 };
  
          Single.just(1)
          .doOnError(new Consumer<Throwable>() {
              @Override
              public void accept(Throwable v) throws Exception {
                  call[0]++;
              }
          })
          .test()
          .assertResult(1);
  
          assertEquals(0, call[0]);
      }
  
      @Test
      public void onErrorCrashes() {
          TestObserverEx<Object> to = Single.error(new TestException("Outer"))
          .doOnError(new Consumer<Throwable>() {
              @Override
              public void accept(Throwable v) throws Exception {
                  throw new TestException("Inner");
              }
          })
          .to(TestHelper.testConsumer())
          .assertFailure(CompositeException.class);
  
          List<Throwable> errors = TestHelper.compositeList(to.errors().get(0));
  
          TestHelper.assertError(errors, 0, TestException.class, "Outer");
          TestHelper.assertError(errors, 1, TestException.class, "Inner");
      }
  
      @Test
      public void doOnEventThrowsSuccess() {
          Single.just(1)
          .doOnEvent(new BiConsumer<Integer, Throwable>() {
              @Override
              public void accept(Integer v, Throwable e) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void doOnEventThrowsError() {
          TestObserverEx<Integer> to = Single.<Integer>error(new TestException("Main"))
          .doOnEvent(new BiConsumer<Integer, Throwable>() {
              @Override
              public void accept(Integer v, Throwable e) throws Exception {
                  throw new TestException("Inner");
              }
          })
          .to(TestHelper.<Integer>testConsumer())
          .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 doOnDisposeDispose() {
          final int[] calls = { 0 };
          TestHelper.checkDisposed(PublishSubject.create().singleOrError().doOnDispose(new Action() {
              @Override
              public void run() throws Exception {
                  calls[0]++;
              }
          }));
  
          assertEquals(1, calls[0]);
      }
  
      @Test
      public void doOnDisposeSuccess() {
          final int[] calls = { 0 };
  
          Single.just(1)
          .doOnDispose(new Action() {
              @Override
              public void run() throws Exception {
                  calls[0]++;
              }
          })
          .test()
          .assertResult(1);
  
          assertEquals(0, calls[0]);
      }
  
      @Test
      public void doOnDisposeError() {
          final int[] calls = { 0 };
  
          Single.error(new TestException())
          .doOnDispose(new Action() {
              @Override
              public void run() throws Exception {
                  calls[0]++;
              }
          })
          .test()
          .assertFailure(TestException.class);
  
          assertEquals(0, calls[0]);
      }
  
      @Test
      public void doOnDisposeDoubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeSingle(new Function<Single<Object>, SingleSource<Object>>() {
              @Override
              public SingleSource<Object> apply(Single<Object> s) throws Exception {
                  return s.doOnDispose(Functions.EMPTY_ACTION);
              }
          });
      }
  
      @Test
      public void doOnDisposeCrash() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              PublishSubject<Integer> ps = PublishSubject.create();
  
              ps.singleOrError().doOnDispose(new Action() {
                  @Override
                  public void run() throws Exception {
                      throw new TestException();
                  }
              })
              .test()
              .dispose();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void doOnSuccessErrors() {
          final int[] call = { 0 };
  
          Single.error(new TestException())
          .doOnSuccess(new Consumer<Object>() {
              @Override
              public void accept(Object v) throws Exception {
                  call[0]++;
              }
          })
          .test()
          .assertFailure(TestException.class);
  
          assertEquals(0, call[0]);
      }
  
      @Test
      public void doOnSuccessCrash() {
          Single.just(1)
          .doOnSuccess(new Consumer<Integer>() {
              @Override
              public void accept(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void onSubscribeCrash() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              final Disposable bs = Disposable.empty();
  
              new Single<Integer>() {
                  @Override
                  protected void subscribeActual(SingleObserver<? super Integer> observer) {
                      observer.onSubscribe(bs);
                      observer.onError(new TestException("Second"));
                      observer.onSuccess(1);
                  }
              }
              .doOnSubscribe(new Consumer<Disposable>() {
                  @Override
                  public void accept(Disposable d) throws Exception {
                      throw new TestException("First");
                  }
              })
              .to(TestHelper.<Integer>testConsumer())
              .assertFailureAndMessage(TestException.class, "First");
  
              assertTrue(bs.isDisposed());
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "Second");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  