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.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.annotations.*;
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.internal.subscriptions.*;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class BasicFuseableSubscriberTest extends RxJavaTest {
  
      @Test
      public void offerThrows() {
          BasicFuseableSubscriber<Integer, Integer> fcs = new BasicFuseableSubscriber<Integer, Integer>(new TestSubscriber<>(0L)) {
  
              @Override
              public void onNext(Integer t) {
              }
  
              @Override
              public int requestFusion(int mode) {
                  return 0;
              }
  
              @Nullable
              @Override
              public Integer poll() throws Exception {
                  return null;
              }
          };
  
          fcs.onSubscribe(new ScalarSubscription<>(fcs, 1));
  
          TestHelper.assertNoOffer(fcs);
  
          assertFalse(fcs.isEmpty());
          fcs.clear();
          assertTrue(fcs.isEmpty());
      }
  
      @Test
      public void implementationStopsOnSubscribe() {
          TestSubscriber<Integer> ts = new TestSubscriber<>();
          BasicFuseableSubscriber<Integer, Integer> bfs = new BasicFuseableSubscriber<Integer, Integer>(ts) {
  
              @Override
              protected boolean beforeDownstream() {
                  return false;
              }
  
              @Override
              public void onNext(@NonNull Integer t) {
                  ts.onNext(t);
              }
  
              @Override
              public int requestFusion(int mode) {
                  // TODO Auto-generated method stub
                  return 0;
              }
  
              @Override
              public @Nullable Integer poll() throws Throwable {
                  return null;
              }
          };
  
          bfs.onSubscribe(new BooleanSubscription());
  
          assertFalse(ts.hasSubscription());
      }
  }
  