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 java.util.concurrent.atomic.AtomicBoolean;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.subscribers.DefaultSubscriber;
  
  public class FlowableDoOnRequestTest extends RxJavaTest {
  
      @Test
      public void unsubscribeHappensAgainstParent() {
          final AtomicBoolean unsubscribed = new AtomicBoolean(false);
          Flowable.just(1).concatWith(Flowable.<Integer>never())
          //
                  .doOnCancel(new Action() {
                      @Override
                      public void run() {
                          unsubscribed.set(true);
                      }
                  })
                  //
                  .doOnRequest(new LongConsumer() {
                      @Override
                      public void accept(long n) {
                          // do nothing
                      }
                  })
                  //
                  .subscribe().dispose();
          assertTrue(unsubscribed.get());
      }
  
      @Test
      public void doRequest() {
          final List<Long> requests = new ArrayList<>();
          Flowable.range(1, 5)
          //
                  .doOnRequest(new LongConsumer() {
                      @Override
                      public void accept(long n) {
                          requests.add(n);
                      }
                  })
                  //
                  .subscribe(new DefaultSubscriber<Integer>() {
  
                      @Override
                      public void onStart() {
                          request(3);
                      }
  
                      @Override
                      public void onComplete() {
  
                      }
  
                      @Override
                      public void onError(Throwable e) {
  
                      }
  
                      @Override
                      public void onNext(Integer t) {
                          request(t);
                      }
                  });
          assertEquals(Arrays.asList(3L, 1L, 2L, 3L, 4L, 5L), requests);
      }
  }
  