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.completable;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class CompletableFromPublisherTest extends RxJavaTest {
      @Test
      public void fromPublisher() {
          Completable.fromPublisher(Flowable.just(1))
              .test()
              .assertResult();
      }
  
      @Test
      public void fromPublisherEmpty() {
          Completable.fromPublisher(Flowable.empty())
              .test()
              .assertResult();
      }
  
      @Test
      public void fromPublisherThrows() {
          Completable.fromPublisher(Flowable.error(new UnsupportedOperationException()))
              .test()
              .assertFailure(UnsupportedOperationException.class);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Completable.fromPublisher(Flowable.just(1)));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowableToCompletable(new Function<Flowable<Object>, Completable>() {
              @Override
              public Completable apply(Flowable<Object> f) throws Exception {
                  return Completable.fromPublisher(f);
              }
          });
      }
  }
  