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.subscribers;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.*;
  
  import org.junit.Test;
  import org.reactivestreams.Subscription;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  
  public class InnerQueuedSubscriberTest extends RxJavaTest {
  
      @Test
      public void requestInBatches() {
          InnerQueuedSubscriberSupport<Integer> support = new InnerQueuedSubscriberSupport<Integer>() {
              @Override
              public void innerNext(InnerQueuedSubscriber<Integer> inner, Integer value) {
              }
  
              @Override
              public void innerError(InnerQueuedSubscriber<Integer> inner, Throwable e) {
              }
  
              @Override
              public void innerComplete(InnerQueuedSubscriber<Integer> inner) {
              }
  
              @Override
              public void drain() {
              }
          };
  
          InnerQueuedSubscriber<Integer> inner = new InnerQueuedSubscriber<>(support, 4);
  
          final List<Long> requests = new ArrayList<>();
  
          inner.onSubscribe(new Subscription() {
              @Override
              public void request(long n) {
                  requests.add(n);
              }
  
              @Override
              public void cancel() {
                  // ignore
              }
          });
  
          inner.request(1);
          inner.request(1);
          inner.request(1);
          inner.request(1);
          inner.request(1);
  
          assertEquals(Arrays.asList(4L, 3L), requests);
      }
  }
  