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.*;
  
  import java.util.*;
  
  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.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.TestHelper;
  
  // moved tests from FlowableLimitTest to here (limit removed as operator)
  public class FlowableTakeTest2 extends RxJavaTest implements LongConsumer, Action {
  
      final List<Long> requests = new ArrayList<>();
  
      static final Long CANCELLED = -100L;
  
      @Override
      public void accept(long t) throws Exception {
          requests.add(t);
      }
  
      @Override
      public void run() throws Exception {
          requests.add(CANCELLED);
      }
  
      @Test
      public void shorterSequence() {
          Flowable.range(1, 5)
          .doOnRequest(this)
          .take(6)
          .test()
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(6, requests.get(0).intValue());
      }
  
      @Test
      public void exactSequence() {
          Flowable.range(1, 5)
          .doOnRequest(this)
          .doOnCancel(this)
          .take(5)
          .test()
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(2, requests.size());
          assertEquals(5, requests.get(0).intValue());
          assertEquals(CANCELLED, requests.get(1));
      }
  
      @Test
      public void longerSequence() {
          Flowable.range(1, 6)
          .doOnRequest(this)
          .take(5)
          .test()
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(5, requests.get(0).intValue());
      }
  
      @Test
      public void error() {
          Flowable.error(new TestException())
          .take(5)
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void takeZero() {
          Flowable.range(1, 5)
          .doOnCancel(this)
          .doOnRequest(this)
          .take(0)
          .test()
          .assertResult();
  
          assertEquals(1, requests.size());
          assertEquals(CANCELLED, requests.get(0));
      }
  
      @Test
      public void takeStep() {
          TestSubscriber<Integer> ts = Flowable.range(1, 6)
          .doOnRequest(this)
          .take(5)
          .test(0L);
  
          assertEquals(0, requests.size());
  
          ts.request(1);
          ts.assertValue(1);
  
          ts.request(2);
          ts.assertValues(1, 2, 3);
  
          ts.request(3);
          ts.assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(1L, 2L, 2L), requests);
      }
  
      @Test
      public void takeThenTake() {
          Flowable.range(1, 5)
          .doOnCancel(this)
          .doOnRequest(this)
          .take(6)
          .take(5)
          .test()
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(5L, CANCELLED), requests);
      }
  
      @Test
      public void noOverrequest() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp
                  .doOnRequest(this)
                  .take(5)
                  .test(0L);
  
          ts.request(5);
          ts.request(10);
  
          assertTrue(pp.offer(1));
          pp.onComplete();
  
          ts.assertResult(1);
      }
  
      @Test
      public void cancelIgnored() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new Flowable<Integer>() {
                  @Override
                  protected void subscribeActual(Subscriber<? super Integer> s) {
                      BooleanSubscription bs = new BooleanSubscription();
                      s.onSubscribe(bs);
  
                      assertTrue(bs.isCancelled());
  
                      s.onNext(1);
                      s.onComplete();
                      s.onError(new TestException());
  
                      s.onSubscribe(null);
                  }
              }
              .take(0)
              .test()
              .assertResult();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
              TestHelper.assertError(errors, 1, NullPointerException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(Flowable.range(1, 5).take(3));
      }
  
      @Test
      public void requestRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final TestSubscriber<Integer> ts = Flowable.range(1, 10)
                      .take(5)
                      .test(0L);
  
              Runnable r = new Runnable() {
                  @Override
                  public void run() {
                      ts.request(3);
                  }
              };
  
              TestHelper.race(r, r);
  
              ts.assertResult(1, 2, 3, 4, 5);
          }
      }
  
      @Test
      public void errorAfterLimitReached() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Flowable.error(new TestException())
              .take(0)
              .test()
              .assertResult();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  