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.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.concurrent.TimeUnit;
  
  import org.junit.*;
  import org.mockito.InOrder;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.schedulers.*;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableTimestampTest extends RxJavaTest {
      Observer<Object> observer;
  
      @Before
      public void before() {
          observer = TestHelper.mockObserver();
      }
  
      @Test
      public void timestampWithScheduler() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
          Observable<Timed<Integer>> m = source.timestamp(scheduler);
          m.subscribe(observer);
  
          source.onNext(1);
          scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
          source.onNext(2);
          scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
          source.onNext(3);
  
          InOrder inOrder = inOrder(observer);
  
          inOrder.verify(observer, times(1)).onNext(new Timed<>(1, 0, TimeUnit.MILLISECONDS));
          inOrder.verify(observer, times(1)).onNext(new Timed<>(2, 100, TimeUnit.MILLISECONDS));
          inOrder.verify(observer, times(1)).onNext(new Timed<>(3, 200, TimeUnit.MILLISECONDS));
  
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, never()).onComplete();
      }
  
      @Test
      public void timestampWithScheduler2() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
          Observable<Timed<Integer>> m = source.timestamp(scheduler);
          m.subscribe(observer);
  
          source.onNext(1);
          source.onNext(2);
          scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
          scheduler.advanceTimeBy(100, TimeUnit.MILLISECONDS);
          source.onNext(3);
  
          InOrder inOrder = inOrder(observer);
  
          inOrder.verify(observer, times(1)).onNext(new Timed<>(1, 0, TimeUnit.MILLISECONDS));
          inOrder.verify(observer, times(1)).onNext(new Timed<>(2, 0, TimeUnit.MILLISECONDS));
          inOrder.verify(observer, times(1)).onNext(new Timed<>(3, 200, TimeUnit.MILLISECONDS));
  
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, never()).onComplete();
      }
  
      @Test
      public void timeIntervalDefault() {
          final TestScheduler scheduler = new TestScheduler();
  
          RxJavaPlugins.setComputationSchedulerHandler(new Function<Scheduler, Scheduler>() {
              @Override
              public Scheduler apply(Scheduler v) throws Exception {
                  return scheduler;
              }
          });
  
          try {
              Observable.range(1, 5)
              .timestamp()
              .map(new Function<Timed<Integer>, Long>() {
                  @Override
                  public Long apply(Timed<Integer> v) throws Exception {
                      return v.time();
                  }
              })
              .test()
              .assertResult(0L, 0L, 0L, 0L, 0L);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void timeIntervalDefaultSchedulerCustomUnit() {
          final TestScheduler scheduler = new TestScheduler();
  
          RxJavaPlugins.setComputationSchedulerHandler(new Function<Scheduler, Scheduler>() {
              @Override
              public Scheduler apply(Scheduler v) throws Exception {
                  return scheduler;
              }
          });
  
          try {
              Observable.range(1, 5)
              .timestamp(TimeUnit.SECONDS)
              .map(new Function<Timed<Integer>, Long>() {
                  @Override
                  public Long apply(Timed<Integer> v) throws Exception {
                      return v.time();
                  }
              })
              .test()
              .assertResult(0L, 0L, 0L, 0L, 0L);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
  }
  