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.single;
  
  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.observers.TestObserver;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class SingleOfTypeTest extends RxJavaTest {
  
      @Test
      public void normal() {
          Single.just(1).ofType(Integer.class)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void normalDowncast() {
          TestObserver<Number> to = Single.just(1)
          .ofType(Number.class)
          .test();
          // don't make this fluent, target type required!
          to.assertResult((Number)1);
      }
  
      @Test
      public void notInstance() {
          TestObserver<String> to = Single.just(1)
          .ofType(String.class)
          .test();
          // don't make this fluent, target type required!
          to.assertResult();
      }
  
      @Test
      public void error() {
          TestObserver<Number> to = Single.<Integer>error(new TestException())
          .ofType(Number.class)
          .test();
          // don't make this fluent, target type required!
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void errorNotInstance() {
          TestObserver<String> to = Single.<Integer>error(new TestException())
          .ofType(String.class)
          .test();
          // don't make this fluent, target type required!
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposedSingleToMaybe(new Function<Single<Object>, Maybe<Object>>() {
              @Override
              public Maybe<Object> apply(Single<Object> m) throws Exception {
                  return m.ofType(Object.class);
              }
          });
      }
  
      @Test
      public void isDisposed() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestHelper.checkDisposed(pp.singleElement().ofType(Object.class));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeSingleToMaybe(new Function<Single<Object>, Maybe<Object>>() {
              @Override
              public Maybe<Object> apply(Single<Object> f) throws Exception {
                  return f.ofType(Object.class);
              }
          });
      }
  }
  