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.Test;
  import org.mockito.InOrder;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.schedulers.*;
  import io.reactivex.rxjava3.subjects.PublishSubject;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ObservableSkipLastTimedTest extends RxJavaTest {
  
      @Test
      public void skipLastTimed() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          // FIXME the timeunit now matters due to rounding
          Observable<Integer> result = source.skipLast(1000, TimeUnit.MILLISECONDS, scheduler);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
  
          scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
  
          source.onNext(4);
          source.onNext(5);
          source.onNext(6);
  
          scheduler.advanceTimeBy(950, TimeUnit.MILLISECONDS);
          source.onComplete();
  
          InOrder inOrder = inOrder(o);
          inOrder.verify(o).onNext(1);
          inOrder.verify(o).onNext(2);
          inOrder.verify(o).onNext(3);
          inOrder.verify(o, never()).onNext(4);
          inOrder.verify(o, never()).onNext(5);
          inOrder.verify(o, never()).onNext(6);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
  
          verify(o, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void skipLastTimedErrorBeforeTime() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          Observable<Integer> result = source.skipLast(1, TimeUnit.SECONDS, scheduler);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
          source.onError(new TestException());
  
          scheduler.advanceTimeBy(1050, TimeUnit.MILLISECONDS);
  
          verify(o).onError(any(TestException.class));
  
          verify(o, never()).onComplete();
          verify(o, never()).onNext(any());
      }
  
      @Test
      public void skipLastTimedCompleteBeforeTime() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          Observable<Integer> result = source.skipLast(1, TimeUnit.SECONDS, scheduler);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
  
          scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
  
          source.onComplete();
  
          InOrder inOrder = inOrder(o);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
  
          verify(o, never()).onNext(any());
          verify(o, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void skipLastTimedWhenAllElementsAreValid() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          Observable<Integer> result = source.skipLast(1, TimeUnit.MILLISECONDS, scheduler);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
  
          scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
  
          source.onComplete();
  
          InOrder inOrder = inOrder(o);
          inOrder.verify(o).onNext(1);
          inOrder.verify(o).onNext(2);
          inOrder.verify(o).onNext(3);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
      }
  
      @Test
      public void skipLastTimedDefaultScheduler() {
          Observable.just(1).concatWith(Observable.just(2).delay(500, TimeUnit.MILLISECONDS))
          .skipLast(300, TimeUnit.MILLISECONDS)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void skipLastTimedDefaultSchedulerDelayError() {
          Observable.just(1).concatWith(Observable.just(2).delay(500, TimeUnit.MILLISECONDS))
          .skipLast(300, TimeUnit.MILLISECONDS, true)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void skipLastTimedCustomSchedulerDelayError() {
          Observable.just(1).concatWith(Observable.just(2).delay(500, TimeUnit.MILLISECONDS))
          .skipLast(300, TimeUnit.MILLISECONDS, Schedulers.io(), true)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(PublishSubject.create().skipLast(1, TimeUnit.DAYS));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
              @Override
              public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
                  return o.skipLast(1, TimeUnit.DAYS);
              }
          });
      }
  
      @Test
      public void onCompleteDisposeRace() {
          TestScheduler scheduler = new TestScheduler();
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
  
              final TestObserver<Integer> to = ps.skipLast(1, TimeUnit.DAYS, scheduler).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onComplete();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void onCompleteDisposeDelayErrorRace() {
          TestScheduler scheduler = new TestScheduler();
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
  
              final TestObserver<Integer> to = ps.skipLast(1, TimeUnit.DAYS, scheduler, true).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onComplete();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void errorDelayed() {
          Observable.error(new TestException())
          .skipLast(1, TimeUnit.DAYS, new TestScheduler(), true)
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void take() {
          Observable.just(1)
          .skipLast(0, TimeUnit.SECONDS)
          .take(1)
          .test()
          .awaitDone(5, TimeUnit.SECONDS)
          .assertResult(1);
      }
  
      @Test
      public void onNextDisposeRace() {
          TestScheduler scheduler = new TestScheduler();
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
  
              final TestObserver<Integer> to = ps.skipLast(1, TimeUnit.DAYS, scheduler).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onNext(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void onNextOnCompleteDisposeDelayErrorRace() {
          TestScheduler scheduler = new TestScheduler();
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final PublishSubject<Integer> ps = PublishSubject.create();
  
              final TestObserver<Integer> to = ps.skipLast(1, TimeUnit.DAYS, scheduler, true).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ps.onNext(1);
                      ps.onComplete();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      to.dispose();
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void skipLastTimedDelayError() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          // FIXME the timeunit now matters due to rounding
          Observable<Integer> result = source.skipLast(1000, TimeUnit.MILLISECONDS, scheduler, true);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
  
          scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
  
          source.onNext(4);
          source.onNext(5);
          source.onNext(6);
  
          scheduler.advanceTimeBy(950, TimeUnit.MILLISECONDS);
          source.onComplete();
  
          InOrder inOrder = inOrder(o);
          inOrder.verify(o).onNext(1);
          inOrder.verify(o).onNext(2);
          inOrder.verify(o).onNext(3);
          inOrder.verify(o, never()).onNext(4);
          inOrder.verify(o, never()).onNext(5);
          inOrder.verify(o, never()).onNext(6);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
  
          verify(o, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void skipLastTimedErrorBeforeTimeDelayError() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          Observable<Integer> result = source.skipLast(1, TimeUnit.SECONDS, scheduler, true);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
          source.onError(new TestException());
  
          scheduler.advanceTimeBy(1050, TimeUnit.MILLISECONDS);
  
          verify(o).onError(any(TestException.class));
  
          verify(o, never()).onComplete();
          verify(o, never()).onNext(any());
      }
  
      @Test
      public void skipLastTimedCompleteBeforeTimeDelayError() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          Observable<Integer> result = source.skipLast(1, TimeUnit.SECONDS, scheduler, true);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
  
          scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
  
          source.onComplete();
  
          InOrder inOrder = inOrder(o);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
  
          verify(o, never()).onNext(any());
          verify(o, never()).onError(any(Throwable.class));
      }
  
      @Test
      public void skipLastTimedWhenAllElementsAreValidDelayError() {
          TestScheduler scheduler = new TestScheduler();
  
          PublishSubject<Integer> source = PublishSubject.create();
  
          Observable<Integer> result = source.skipLast(1, TimeUnit.MILLISECONDS, scheduler, true);
  
          Observer<Object> o = TestHelper.mockObserver();
  
          result.subscribe(o);
  
          source.onNext(1);
          source.onNext(2);
          source.onNext(3);
  
          scheduler.advanceTimeBy(500, TimeUnit.MILLISECONDS);
  
          source.onComplete();
  
          InOrder inOrder = inOrder(o);
          inOrder.verify(o).onNext(1);
          inOrder.verify(o).onNext(2);
          inOrder.verify(o).onNext(3);
          inOrder.verify(o).onComplete();
          inOrder.verifyNoMoreInteractions();
      }
  }
  