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.observable;
  
  import static org.junit.Assert.*;
  
  import java.util.concurrent.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.operators.ScalarSupplier;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ObservableFromTest extends RxJavaTest {
  
      @Test
      public void fromFutureTimeout() throws Exception {
          Observable.fromFuture(Observable.never()
          .toFuture(), 100, TimeUnit.MILLISECONDS)
          .subscribeOn(Schedulers.io())
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertFailure(TimeoutException.class);
      }
  
      @Test
      public void fromPublisher() {
          Observable.fromPublisher(Flowable.just(1))
          .test()
          .assertResult(1);
      }
  
      @Test
      public void just10() {
          Observable.just(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
          .test()
          .assertResult(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      }
  
      @Test
      public void fromArrayEmpty() {
          assertSame(Observable.empty(), Observable.fromArray());
      }
  
      @Test
      public void fromArraySingle() {
          assertTrue(Observable.fromArray(1) instanceof ScalarSupplier);
      }
  
      @Test
      public void fromPublisherDispose() {
          TestHelper.checkDisposed(Flowable.just(1).toObservable());
      }
  
      @Test
      public void fromPublisherDoubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowableToObservable(new Function<Flowable<Object>, ObservableSource<Object>>() {
              @Override
              public ObservableSource<Object> apply(Flowable<Object> f) throws Exception {
                  return f.toObservable();
              }
          });
      }
  
      @Test
      public void fusionRejected() {
          TestObserverEx<Integer> to = new TestObserverEx<>(QueueFuseable.ASYNC);
  
          Observable.fromArray(1, 2, 3)
          .subscribe(to);
  
          to.assertFusionMode(QueueFuseable.NONE)
          .assertResult(1, 2, 3);
      }
  }
  