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.maybe;
  
  import static org.junit.Assert.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.fuseable.HasUpstreamMaybeSource;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeContainsTest extends RxJavaTest {
  
      @Test
      public void doesContain() {
          Maybe.just(1).contains(1).test().assertResult(true);
      }
  
      @Test
      public void doesntContain() {
          Maybe.just(1).contains(2).test().assertResult(false);
      }
  
      @Test
      public void empty() {
          Maybe.empty().contains(2).test().assertResult(false);
      }
  
      @Test
      public void error() {
          Maybe.error(new TestException()).contains(2).test().assertFailure(TestException.class);
      }
  
      @Test
      public void dispose() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestObserver<Boolean> to = pp.singleElement().contains(1).test();
  
          assertTrue(pp.hasSubscribers());
  
          to.dispose();
  
          assertFalse(pp.hasSubscribers());
      }
  
      @Test
      public void isDisposed() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestHelper.checkDisposed(pp.singleElement().contains(1));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeMaybeToSingle(new Function<Maybe<Object>, SingleSource<Boolean>>() {
              @Override
              public SingleSource<Boolean> apply(Maybe<Object> f) throws Exception {
                  return f.contains(1);
              }
          });
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void hasSource() {
          assertSame(Maybe.empty(), ((HasUpstreamMaybeSource<Object>)(Maybe.empty().contains(0))).source());
      }
  }
  