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.subscribers;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  
  public class DefaultSubscriberTest extends RxJavaTest {
  
      static final class RequestEarly extends DefaultSubscriber<Integer> {
  
          final List<Object> events = new ArrayList<>();
  
          RequestEarly() {
              request(5);
          }
  
          @Override
          protected void onStart() {
          }
  
          @Override
          public void onNext(Integer t) {
              events.add(t);
          }
  
          @Override
          public void onError(Throwable t) {
              events.add(t);
          }
  
          @Override
          public void onComplete() {
              events.add("Done");
          }
  
      }
  
      @Test
      public void requestUpfront() {
          RequestEarly sub = new RequestEarly();
  
          Flowable.range(1, 10).subscribe(sub);
  
          assertEquals(Collections.emptyList(), sub.events);
      }
  
  }
  