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 java.util.concurrent.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.subjects.MaybeSubject;
  
  public class MaybeToFutureTest extends RxJavaTest {
  
      @Test
      public void success() throws Exception {
          assertEquals((Integer)1, Maybe.just(1)
          .subscribeOn(Schedulers.computation())
          .toFuture()
          .get());
      }
  
      @Test
      public void empty() throws Exception {
          assertNull(Maybe.empty()
          .subscribeOn(Schedulers.computation())
          .toFuture()
          .get());
      }
  
      @Test
      public void error() throws InterruptedException {
          try {
              Maybe.error(new TestException())
              .subscribeOn(Schedulers.computation())
              .toFuture()
              .get();
  
              fail("Should have thrown!");
          } catch (ExecutionException ex) {
              assertTrue("" + ex.getCause(), ex.getCause() instanceof TestException);
          }
      }
  
      @Test
      public void cancel() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          Future<Integer> f = ms.toFuture();
  
          assertTrue(ms.hasObservers());
  
          f.cancel(true);
  
          assertFalse(ms.hasObservers());
      }
  
      @Test
      public void cancel2() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          Future<Integer> f = ms.toFuture();
  
          assertTrue(ms.hasObservers());
  
          f.cancel(false);
  
          assertFalse(ms.hasObservers());
      }
  }
  