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 org.junit.Test;
  import org.reactivestreams.Publisher;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.MissingBackpressureException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableOnBackpressureErrorTest extends RxJavaTest {
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Observable.just(1).toFlowable(BackpressureStrategy.ERROR));
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(Observable.just(1).toFlowable(BackpressureStrategy.ERROR));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Publisher<Object>>() {
              @Override
              public Publisher<Object> apply(Flowable<Object> f) throws Exception {
                  return new FlowableOnBackpressureError<>(f);
              }
          });
      }
  
      @Test
      public void badSource() {
          TestHelper.<Integer>checkBadSourceFlowable(new Function<Flowable<Integer>, Object>() {
              @Override
              public Object apply(Flowable<Integer> f) throws Exception {
                  return new FlowableOnBackpressureError<>(f);
              }
          }, false, 1, 1, 1);
      }
  
      @Test
      public void overflowCancels() {
          PublishSubject<Integer> ps = PublishSubject.create();
  
          TestSubscriber<Integer> ts = ps.toFlowable(BackpressureStrategy.ERROR)
          .test(0L);
  
          assertTrue(ps.hasObservers());
  
          ps.onNext(1);
  
          assertFalse(ps.hasObservers());
  
          ts.assertFailure(MissingBackpressureException.class);
      }
  }
  