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.single;
  
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.Single;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.schedulers.*;
  import io.reactivex.rxjava3.subjects.SingleSubject;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class SingleTimestampTest {
  
      @Test
      public void just() {
          Single.just(1)
          .timeInterval()
          .test()
          .assertValueCount(1)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void error() {
          Single.error(new TestException())
          .timeInterval()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void justSeconds() {
          Single.just(1)
          .timeInterval(TimeUnit.SECONDS)
          .test()
          .assertValueCount(1)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void justScheduler() {
          Single.just(1)
          .timeInterval(Schedulers.single())
          .test()
          .assertValueCount(1)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void justSecondsScheduler() {
          Single.just(1)
          .timeInterval(TimeUnit.SECONDS, Schedulers.single())
          .test()
          .assertValueCount(1)
          .assertNoErrors()
          .assertComplete();
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeSingle(m -> m.timeInterval());
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(SingleSubject.create().timeInterval());
      }
  
      @Test
      public void timeInfo() {
          TestScheduler scheduler = new TestScheduler();
  
          SingleSubject<Integer> ss = SingleSubject.create();
  
          TestObserver<Timed<Integer>> to = ss
          .timeInterval(scheduler)
          .test();
  
          scheduler.advanceTimeBy(1000, TimeUnit.MILLISECONDS);
  
          ss.onSuccess(1);
  
          to.assertResult(new Timed<>(1, 1000L, TimeUnit.MILLISECONDS));
      }
  }
  