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.fail;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.List;
  
  import org.junit.*;
  import org.reactivestreams.*;
  
  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.*;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowableTakeWhileTest extends RxJavaTest {
  
      @Test
      public void takeWhile1() {
          Flowable<Integer> w = Flowable.just(1, 2, 3);
          Flowable<Integer> take = w.takeWhile(new Predicate<Integer>() {
              @Override
              public boolean test(Integer input) {
                  return input < 3;
              }
          });
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
          take.subscribe(subscriber);
  
          verify(subscriber, times(1)).onNext(1);
          verify(subscriber, times(1)).onNext(2);
          verify(subscriber, never()).onNext(3);
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber, times(1)).onComplete();
      }
  
      @Test
      public void takeWhileOnSubject1() {
          FlowableProcessor<Integer> s = PublishProcessor.create();
          Flowable<Integer> take = s.takeWhile(new Predicate<Integer>() {
              @Override
              public boolean test(Integer input) {
                  return input < 3;
              }
          });
  
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
          take.subscribe(subscriber);
  
          s.onNext(1);
          s.onNext(2);
          s.onNext(3);
          s.onNext(4);
          s.onNext(5);
          s.onComplete();
  
          verify(subscriber, times(1)).onNext(1);
          verify(subscriber, times(1)).onNext(2);
          verify(subscriber, never()).onNext(3);
          verify(subscriber, never()).onNext(4);
          verify(subscriber, never()).onNext(5);
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber, times(1)).onComplete();
      }
  
      @Test
      public void takeWhile2() {
          Flowable<String> w = Flowable.just("one", "two", "three");
          Flowable<String> take = w.takeWhile(new Predicate<String>() {
              int index;
  
              @Override
              public boolean test(String input) {
                  return index++ < 2;
              }
          });
  
          Subscriber<String> subscriber = TestHelper.mockSubscriber();
          take.subscribe(subscriber);
  
          verify(subscriber, times(1)).onNext("one");
          verify(subscriber, times(1)).onNext("two");
          verify(subscriber, never()).onNext("three");
          verify(subscriber, never()).onError(any(Throwable.class));
          verify(subscriber, times(1)).onComplete();
      }
  
      @Test
      public void takeWhileDoesntLeakErrors() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Flowable<String> source = Flowable.unsafeCreate(new Publisher<String>() {
                  @Override
                  public void subscribe(Subscriber<? super String> subscriber) {
                      subscriber.onSubscribe(new BooleanSubscription());
                      subscriber.onNext("one");
                      subscriber.onError(new TestException("test failed"));
                  }
              });
  
              source.takeWhile(new Predicate<String>() {
                  @Override
                  public boolean test(String s) {
                      return false;
                  }
              }).blockingLast("");
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "test failed");
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void takeWhileProtectsPredicateCall() {
          TestFlowable source = new TestFlowable(mock(Subscription.class), "one");
          final RuntimeException testException = new RuntimeException("test exception");
  
          Subscriber<String> subscriber = TestHelper.mockSubscriber();
          Flowable<String> take = Flowable.unsafeCreate(source)
                  .takeWhile(new Predicate<String>() {
              @Override
              public boolean test(String s) {
                  throw testException;
              }
          });
          take.subscribe(subscriber);
  
          // wait for the Flowable to complete
          try {
              source.t.join();
          } catch (Throwable e) {
              e.printStackTrace();
              fail(e.getMessage());
          }
  
          verify(subscriber, never()).onNext(any(String.class));
          verify(subscriber, times(1)).onError(testException);
      }
  
      @Test
      public void unsubscribeAfterTake() {
          Subscription s = mock(Subscription.class);
          TestFlowable w = new TestFlowable(s, "one", "two", "three");
  
          Subscriber<String> subscriber = TestHelper.mockSubscriber();
          Flowable<String> take = Flowable.unsafeCreate(w)
                  .takeWhile(new Predicate<String>() {
              int index;
  
              @Override
              public boolean test(String s) {
                  return index++ < 1;
              }
          });
          take.subscribe(subscriber);
  
          // wait for the Flowable to complete
          try {
              w.t.join();
          } catch (Throwable e) {
              e.printStackTrace();
              fail(e.getMessage());
          }
  
          System.out.println("TestFlowable thread finished");
          verify(subscriber, times(1)).onNext("one");
          verify(subscriber, never()).onNext("two");
          verify(subscriber, never()).onNext("three");
          verify(s, times(1)).cancel();
      }
  
      private static class TestFlowable implements Publisher<String> {
  
          final Subscription upstream;
          final String[] values;
          Thread t;
  
          TestFlowable(Subscription s, String... values) {
              this.upstream = s;
              this.values = values;
          }
  
          @Override
          public void subscribe(final Subscriber<? super String> subscriber) {
              System.out.println("TestFlowable subscribed to ...");
              subscriber.onSubscribe(upstream);
              t = new Thread(new Runnable() {
  
                  @Override
                  public void run() {
                      try {
                          System.out.println("running TestFlowable thread");
                          for (String s : values) {
                              System.out.println("TestFlowable onNext: " + s);
                              subscriber.onNext(s);
                          }
                          subscriber.onComplete();
                      } catch (Throwable e) {
                          throw new RuntimeException(e);
                      }
                  }
  
              });
              System.out.println("starting TestFlowable thread");
              t.start();
              System.out.println("done starting TestFlowable thread");
          }
      }
  
      @Test
      public void backpressure() {
          Flowable<Integer> source = Flowable.range(1, 1000).takeWhile(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 100;
              }
          });
          TestSubscriber<Integer> ts = new TestSubscriber<>(5L);
  
          source.subscribe(ts);
  
          ts.assertNoErrors();
          ts.assertValues(1, 2, 3, 4, 5);
  
          ts.request(5);
  
          ts.assertNoErrors();
          ts.assertValues(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      }
  
      @Test
      public void noUnsubscribeDownstream() {
          Flowable<Integer> source = Flowable.range(1, 1000).takeWhile(new Predicate<Integer>() {
              @Override
              public boolean test(Integer t1) {
                  return t1 < 2;
              }
          });
          TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          source.subscribe(ts);
  
          ts.assertNoErrors();
          ts.assertValue(1);
  
          Assert.assertFalse("Unsubscribed!", ts.isCancelled());
      }
  
      @Test
      public void errorCauseIncludesLastValue() {
          TestSubscriberEx<String> ts = new TestSubscriberEx<>();
          Flowable.just("abc").takeWhile(new Predicate<String>() {
              @Override
              public boolean test(String t1) {
                  throw new TestException();
              }
          }).subscribe(ts);
  
          ts.assertTerminated();
          ts.assertNoValues();
          ts.assertError(TestException.class);
          // FIXME last cause value not recorded
  //        assertTrue(ts.getOnErrorEvents().get(0).getCause().getMessage().contains("abc"));
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(PublishProcessor.create().takeWhile(Functions.alwaysTrue()));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Object>>() {
              @Override
              public Flowable<Object> apply(Flowable<Object> f) throws Exception {
                  return f.takeWhile(Functions.alwaysTrue());
              }
          });
      }
  
      @Test
      public void badSource() {
          new Flowable<Integer>() {
              @Override
              protected void subscribeActual(Subscriber<? super Integer> subscriber) {
                  subscriber.onSubscribe(new BooleanSubscription());
                  subscriber.onComplete();
                  subscriber.onComplete();
              }
          }
          .takeWhile(Functions.alwaysTrue())
          .test()
          .assertResult();
      }
  
  }
  