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.observable;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import io.reactivex.rxjava3.disposables.Disposable;
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ObservableAnyTest extends RxJavaTest {
  
      @Test
      public void anyWithTwoItemsObservable() {
          Observable<Integer> w = Observable.just(1, 2);
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(false);
          verify(observer, times(1)).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void isEmptyWithTwoItemsObservable() {
          Observable<Integer> w = Observable.just(1, 2);
          Observable<Boolean> observable = w.isEmpty().toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(true);
          verify(observer, times(1)).onNext(false);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void anyWithOneItemObservable() {
          Observable<Integer> w = Observable.just(1);
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(false);
          verify(observer, times(1)).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void isEmptyWithOneItemObservable() {
          Observable<Integer> w = Observable.just(1);
          Observable<Boolean> observable = w.isEmpty().toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(true);
          verify(observer, times(1)).onNext(false);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void anyWithEmptyObservable() {
          Observable<Integer> w = Observable.empty();
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, times(1)).onNext(false);
          verify(observer, never()).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void isEmptyWithEmptyObservable() {
          Observable<Integer> w = Observable.empty();
          Observable<Boolean> observable = w.isEmpty().toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, times(1)).onNext(true);
          verify(observer, never()).onNext(false);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void anyWithPredicate1Observable() {
          Observable<Integer> w = Observable.just(1, 2, 3);
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 2;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(false);
          verify(observer, times(1)).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void exists1Observable() {
          Observable<Integer> w = Observable.just(1, 2, 3);
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 2;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, never()).onNext(false);
          verify(observer, times(1)).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void anyWithPredicate2Observable() {
          Observable<Integer> w = Observable.just(1, 2, 3);
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 1;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, times(1)).onNext(false);
          verify(observer, never()).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void anyWithEmptyAndPredicateObservable() {
          // If the source is empty, always output false.
          Observable<Integer> w = Observable.empty();
          Observable<Boolean> observable = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t) {
                  return true;
              }
          }).toObservable();
  
          Observer<Boolean> observer = TestHelper.mockObserver();
  
          observable.subscribe(observer);
  
          verify(observer, times(1)).onNext(false);
          verify(observer, never()).onNext(true);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void withFollowingFirstObservable() {
          Observable<Integer> o = Observable.fromArray(1, 3, 5, 6);
          Observable<Boolean> anyEven = o.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer i) {
                  return i % 2 == 0;
              }
          }).toObservable();
  
          assertTrue(anyEven.blockingFirst());
      }
  
      @Test
      public void issue1935NoUnsubscribeDownstreamObservable() {
          Observable<Integer> source = Observable.just(1).isEmpty().toObservable()
              .flatMap(new Function<Boolean, Observable<Integer>>() {
                  @Override
                  public Observable<Integer> apply(Boolean t1) {
                      return Observable.just(2).delay(500, TimeUnit.MILLISECONDS);
                  }
              });
  
          assertEquals((Object)2, source.blockingFirst());
      }
  
      @Test
      public void predicateThrowsExceptionAndValueInCauseMessageObservable() {
          TestObserverEx<Boolean> to = new TestObserverEx<>();
          final IllegalArgumentException ex = new IllegalArgumentException();
  
          Observable.just("Boo!").any(new Predicate<String>() {
              @Override
              public boolean test(String v) {
                  throw ex;
              }
          }).subscribe(to);
  
          to.assertTerminated();
          to.assertNoValues();
          to.assertNotComplete();
          to.assertError(ex);
          // FIXME value as last cause?
  //        assertTrue(ex.getCause().getMessage().contains("Boo!"));
      }
  
      @Test
      public void anyWithTwoItems() {
          Observable<Integer> w = Observable.just(1, 2);
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, never()).onSuccess(false);
          verify(observer, times(1)).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void isEmptyWithTwoItems() {
          Observable<Integer> w = Observable.just(1, 2);
          Single<Boolean> single = w.isEmpty();
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, never()).onSuccess(true);
          verify(observer, times(1)).onSuccess(false);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void anyWithOneItem() {
          Observable<Integer> w = Observable.just(1);
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, never()).onSuccess(false);
          verify(observer, times(1)).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void isEmptyWithOneItem() {
          Observable<Integer> w = Observable.just(1);
          Single<Boolean> single = w.isEmpty();
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, never()).onSuccess(true);
          verify(observer, times(1)).onSuccess(false);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void anyWithEmpty() {
          Observable<Integer> w = Observable.empty();
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, times(1)).onSuccess(false);
          verify(observer, never()).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void isEmptyWithEmpty() {
          Observable<Integer> w = Observable.empty();
          Single<Boolean> single = w.isEmpty();
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, times(1)).onSuccess(true);
          verify(observer, never()).onSuccess(false);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void anyWithPredicate1() {
          Observable<Integer> w = Observable.just(1, 2, 3);
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 2;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, never()).onSuccess(false);
          verify(observer, times(1)).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void exists1() {
          Observable<Integer> w = Observable.just(1, 2, 3);
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 2;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, never()).onSuccess(false);
          verify(observer, times(1)).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void anyWithPredicate2() {
          Observable<Integer> w = Observable.just(1, 2, 3);
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 1;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, times(1)).onSuccess(false);
          verify(observer, never()).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void anyWithEmptyAndPredicate() {
          // If the source is empty, always output false.
          Observable<Integer> w = Observable.empty();
          Single<Boolean> single = w.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t) {
                  return true;
              }
          });
  
          SingleObserver<Boolean> observer = TestHelper.mockSingleObserver();
  
          single.subscribe(observer);
  
          verify(observer, times(1)).onSuccess(false);
          verify(observer, never()).onSuccess(true);
          verify(observer, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void withFollowingFirst() {
          Observable<Integer> o = Observable.fromArray(1, 3, 5, 6);
          Single<Boolean> anyEven = o.any(new Predicate<Integer>() {
              @Override
              public boolean test(Integer i) {
                  return i % 2 == 0;
              }
          });
  
          assertTrue(anyEven.blockingGet());
      }
  
      @Test
      public void issue1935NoUnsubscribeDownstream() {
          Observable<Integer> source = Observable.just(1).isEmpty()
              .flatMapObservable(new Function<Boolean, Observable<Integer>>() {
                  @Override
                  public Observable<Integer> apply(Boolean t1) {
                      return Observable.just(2).delay(500, TimeUnit.MILLISECONDS);
                  }
              });
  
          assertEquals((Object)2, source.blockingFirst());
      }
  
      @Test
      public void predicateThrowsExceptionAndValueInCauseMessage() {
          TestObserverEx<Boolean> to = new TestObserverEx<>();
          final IllegalArgumentException ex = new IllegalArgumentException();
  
          Observable.just("Boo!").any(new Predicate<String>() {
              @Override
              public boolean test(String v) {
                  throw ex;
              }
          }).subscribe(to);
  
          to.assertTerminated();
          to.assertNoValues();
          to.assertNotComplete();
          to.assertError(ex);
          // FIXME value as last cause?
  //        assertTrue(ex.getCause().getMessage().contains("Boo!"));
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Observable.just(1).any(Functions.alwaysTrue()).toObservable());
  
          TestHelper.checkDisposed(Observable.just(1).any(Functions.alwaysTrue()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Boolean>>() {
              @Override
              public ObservableSource<Boolean> apply(Observable<Object> o) throws Exception {
                  return o.any(Functions.alwaysTrue()).toObservable();
              }
          });
          TestHelper.checkDoubleOnSubscribeObservableToSingle(new Function<Observable<Object>, SingleSource<Boolean>>() {
              @Override
              public SingleSource<Boolean> apply(Observable<Object> o) throws Exception {
                  return o.any(Functions.alwaysTrue());
              }
          });
      }
  
      @Test
      public void predicateThrowsSuppressOthers() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Observable<Integer>() {
                  @Override
                  protected void subscribeActual(Observer<? super Integer> observer) {
                      observer.onSubscribe(Disposable.empty());
  
                      observer.onNext(1);
                      observer.onNext(2);
                      observer.onError(new IOException());
                      observer.onComplete();
                  }
              }
              .any(new Predicate<Integer>() {
                  @Override
                  public boolean test(Integer v) throws Exception {
                      throw new TestException();
                  }
              })
              .toObservable()
              .test()
              .assertFailure(TestException.class);
  
              TestHelper.assertUndeliverable(errors, 0, IOException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void badSourceSingle() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Observable<Integer>() {
                  @Override
                  protected void subscribeActual(Observer<? super Integer> observer) {
                      observer.onSubscribe(Disposable.empty());
                      observer.onError(new TestException("First"));
  
                      observer.onNext(1);
                      observer.onError(new TestException("Second"));
                      observer.onComplete();
                  }
              }
              .any(Functions.alwaysTrue())
              .to(TestHelper.<Boolean>testConsumer())
              .assertFailureAndMessage(TestException.class, "First");
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "Second");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  