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.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  
  import org.junit.Test;
  import org.reactivestreams.Subscriber;
  
  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.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowableTakeUntilPredicateTest extends RxJavaTest {
      @Test
      public void takeEmpty() {
          Subscriber<Object> subscriber = TestHelper.mockSubscriber();
  
          Flowable.empty().takeUntil(new Predicate<Object>() {
              @Override
              public boolean test(Object v) {
                  return true;
              }
          }).subscribe(subscriber);
  
          verify(subscriber, never()).onNext(any());
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber).onComplete();
      }
  
      @Test
      public void takeAll() {
          Subscriber<Object> subscriber = TestHelper.mockSubscriber();
  
          Flowable.just(1, 2).takeUntil(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return false;
              }
          }).subscribe(subscriber);
  
          verify(subscriber).onNext(1);
          verify(subscriber).onNext(2);
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber).onComplete();
      }
  
      @Test
      public void takeFirst() {
          Subscriber<Object> subscriber = TestHelper.mockSubscriber();
  
          Flowable.just(1, 2).takeUntil(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return true;
              }
          }).subscribe(subscriber);
  
          verify(subscriber).onNext(1);
          verify(subscriber, never()).onNext(2);
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber).onComplete();
      }
  
      @Test
      public void takeSome() {
          Subscriber<Object> subscriber = TestHelper.mockSubscriber();
  
          Flowable.just(1, 2, 3).takeUntil(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 == 2;
              }
          })
          .subscribe(subscriber);
  
          verify(subscriber).onNext(1);
          verify(subscriber).onNext(2);
          verify(subscriber, never()).onNext(3);
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber).onComplete();
      }
  
      @Test
      public void functionThrows() {
          Subscriber<Object> subscriber = TestHelper.mockSubscriber();
  
          Predicate<Integer> predicate = new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                      throw new TestException("Forced failure");
              }
          };
          Flowable.just(1, 2, 3).takeUntil(predicate).subscribe(subscriber);
  
          verify(subscriber).onNext(1);
          verify(subscriber, never()).onNext(2);
          verify(subscriber, never()).onNext(3);
          verify(subscriber).onError(any(TestException.class));
          verify(subscriber, never()).onComplete();
      }
  
      @Test
      public void sourceThrows() {
          Subscriber<Object> subscriber = TestHelper.mockSubscriber();
  
          Flowable.just(1)
          .concatWith(Flowable.<Integer>error(new TestException()))
          .concatWith(Flowable.just(2))
          .takeUntil(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return false;
              }
          }).subscribe(subscriber);
  
          verify(subscriber).onNext(1);
          verify(subscriber, never()).onNext(2);
          verify(subscriber).onError(any(TestException.class));
          verify(subscriber, never()).onComplete();
      }
  
      @Test
      public void backpressure() {
          TestSubscriber<Integer> ts = new TestSubscriber<>(5L);
  
          Flowable.range(1, 1000).takeUntil(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) {
                  return false;
              }
          }).subscribe(ts);
  
          ts.assertNoErrors();
          ts.assertValues(1, 2, 3, 4, 5);
          ts.assertNotComplete();
      }
  
      @Test
      public void errorIncludesLastValueAsCause() {
          TestSubscriberEx<String> ts = new TestSubscriberEx<>();
          final TestException e = new TestException("Forced failure");
          Predicate<String> predicate = new Predicate<String>() {
              @Override
              public boolean test(String t) {
                      throw e;
              }
          };
          Flowable.just("abc").takeUntil(predicate).subscribe(ts);
  
          ts.assertTerminated();
          ts.assertNotComplete();
          ts.assertError(TestException.class);
          // FIXME last cause value is not saved
  //        assertTrue(ts.errors().get(0).getCause().getMessage().contains("abc"));
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(PublishProcessor.create().takeUntil(Functions.alwaysFalse()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Object>>() {
              @Override
              public Flowable<Object> apply(Flowable<Object> f) throws Exception {
                  return f.takeUntil(Functions.alwaysFalse());
              }
          });
      }
  
      @Test
      public void badSource() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Flowable<Integer>() {
                  @Override
                  protected void subscribeActual(Subscriber<? super Integer> subscriber) {
                      subscriber.onSubscribe(new BooleanSubscription());
                      subscriber.onComplete();
                      subscriber.onNext(1);
                      subscriber.onError(new TestException());
                      subscriber.onComplete();
                  }
              }
              .takeUntil(Functions.alwaysFalse())
              .test()
              .assertResult();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  