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 java.util.concurrent.CompletableFuture;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class SingleFromCompletionStageTest extends RxJavaTest {
  
      @Test
      public void syncSuccess() {
          Single.fromCompletionStage(CompletableFuture.completedFuture(1))
          .test()
          .assertResult(1);
      }
  
      @Test
      public void syncFailure() {
          CompletableFuture<Integer> cf = new CompletableFuture<>();
          cf.completeExceptionally(new TestException());
  
          Single.fromCompletionStage(cf)
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void syncNull() {
          Single.fromCompletionStage(CompletableFuture.<Integer>completedFuture(null))
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void dispose() {
          CompletableFuture<Integer> cf = new CompletableFuture<>();
  
          TestObserver<Integer> to = Single.fromCompletionStage(cf)
          .test();
  
          to.assertEmpty();
  
          to.dispose();
  
          cf.complete(1);
  
          to.assertEmpty();
      }
  
      @Test
      public void dispose2() {
          TestHelper.checkDisposed(Single.fromCompletionStage(new CompletableFuture<>()));
      }
  }
  