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.jdk8;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.Optional;
  
  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.testsupport.TestHelper;
  
  public class MaybeMapOptionalTest extends RxJavaTest {
  
      @Test
      public void successSuccess() {
          Maybe.just(1)
          .mapOptional(Optional::of)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void successEmpty() {
          Maybe.just(1)
          .mapOptional(v -> Optional.empty())
          .test()
          .assertResult();
      }
  
      @Test
      public void empty() throws Throwable {
          @SuppressWarnings("unchecked")
          Function<? super Integer, Optional<? extends Integer>> f = mock(Function.class);
  
          Maybe.<Integer>empty()
          .mapOptional(f)
          .test()
          .assertResult();
  
          verify(f, never()).apply(any());
      }
  
      @Test
      public void error() throws Throwable {
          @SuppressWarnings("unchecked")
          Function<? super Integer, Optional<? extends Integer>> f = mock(Function.class);
  
          Maybe.<Integer>error(new TestException())
          .mapOptional(f)
          .test()
          .assertFailure(TestException.class);
  
          verify(f, never()).apply(any());
      }
  
      @Test
      public void mapperCrash() {
          Maybe.just(1)
          .mapOptional(v -> { throw new TestException(); })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Maybe.never().mapOptional(Optional::of));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeMaybe(m -> m.mapOptional(Optional::of));
      }
  }
  