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 java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.internal.operators.observable.ObservableInterval.IntervalObserver;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.schedulers.*;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableIntervalTest extends RxJavaTest {
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Observable.interval(1, TimeUnit.MILLISECONDS, new TestScheduler()));
      }
  
      @Test
      public void cancel() {
          Observable.interval(1, TimeUnit.MILLISECONDS, Schedulers.trampoline())
          .take(10)
          .test()
          .assertResult(0L, 1L, 2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L);
      }
  
      @Test
      public void cancelledOnRun() {
          TestObserver<Long> to = new TestObserver<>();
          IntervalObserver is = new IntervalObserver(to);
          to.onSubscribe(is);
  
          is.dispose();
  
          is.run();
  
          to.assertEmpty();
      }
  }
  