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.flowable;
  
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.concurrent.TimeUnit;
  
  import io.reactivex.rxjava3.core.Observer;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Action;
  import org.junit.Test;
  import org.mockito.InOrder;
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.schedulers.TestScheduler;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableThrottleLastTests extends RxJavaTest {
  
      @Test
      public void throttleWithDroppedCallbackException() throws Throwable {
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
          Action whenDisposed = mock(Action.class);
  
          TestScheduler s = new TestScheduler();
          PublishProcessor<Integer> o = PublishProcessor.create();
          o.doOnCancel(whenDisposed)
           .throttleLast(500, TimeUnit.MILLISECONDS, s, e-> {
                      if (e == 1) {
                          throw new TestException("forced");
                      }
                  })
                 .subscribe(subscriber);
  
          // send events with simulated time increments
          s.advanceTimeTo(0, TimeUnit.MILLISECONDS);
          o.onNext(1); // skip
          o.onNext(2); // deliver
          s.advanceTimeTo(501, TimeUnit.MILLISECONDS);
  
          InOrder inOrder = inOrder(subscriber);
          inOrder.verify(subscriber).onError(any(TestException.class));
          inOrder.verifyNoMoreInteractions();
          verify(whenDisposed).run();
      }
  
      @Test
      public void throttleWithDroppedCallback() {
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
          Observer<Object> dropCallbackObserver = TestHelper.mockObserver();
  
          TestScheduler s = new TestScheduler();
          PublishProcessor<Integer> o = PublishProcessor.create();
          o.throttleLast(500, TimeUnit.MILLISECONDS, s, dropCallbackObserver::onNext).subscribe(subscriber);
  
          // send events with simulated time increments
          s.advanceTimeTo(0, TimeUnit.MILLISECONDS);
          o.onNext(1); // skip
          o.onNext(2); // deliver
          s.advanceTimeTo(501, TimeUnit.MILLISECONDS);
          o.onNext(3); // skip
          s.advanceTimeTo(600, TimeUnit.MILLISECONDS);
          o.onNext(4); // skip
          s.advanceTimeTo(700, TimeUnit.MILLISECONDS);
          o.onNext(5); // skip
          o.onNext(6); // deliver
          s.advanceTimeTo(1001, TimeUnit.MILLISECONDS);
          o.onNext(7); // deliver
          s.advanceTimeTo(1501, TimeUnit.MILLISECONDS);
          o.onComplete();
  
          InOrder inOrder = inOrder(subscriber);
          InOrder dropCallbackOrder = inOrder(dropCallbackObserver);
          dropCallbackOrder.verify(dropCallbackObserver).onNext(1);
          inOrder.verify(subscriber).onNext(2);
          dropCallbackOrder.verify(dropCallbackObserver).onNext(3);
          dropCallbackOrder.verify(dropCallbackObserver).onNext(4);
          dropCallbackOrder.verify(dropCallbackObserver).onNext(5);
          inOrder.verify(subscriber).onNext(6);
          inOrder.verify(subscriber).onNext(7);
          inOrder.verify(subscriber).onComplete();
          inOrder.verifyNoMoreInteractions();
          dropCallbackOrder.verifyNoMoreInteractions();
      }
  
      @Test
      public void throttle() {
          Subscriber<Integer> subscriber = TestHelper.mockSubscriber();
  
          TestScheduler s = new TestScheduler();
          PublishProcessor<Integer> o = PublishProcessor.create();
          o.throttleLast(500, TimeUnit.MILLISECONDS, s).subscribe(subscriber);
  
          // send events with simulated time increments
          s.advanceTimeTo(0, TimeUnit.MILLISECONDS);
          o.onNext(1); // skip
          o.onNext(2); // deliver
          s.advanceTimeTo(501, TimeUnit.MILLISECONDS);
          o.onNext(3); // skip
          s.advanceTimeTo(600, TimeUnit.MILLISECONDS);
          o.onNext(4); // skip
          s.advanceTimeTo(700, TimeUnit.MILLISECONDS);
          o.onNext(5); // skip
          o.onNext(6); // deliver
          s.advanceTimeTo(1001, TimeUnit.MILLISECONDS);
          o.onNext(7); // deliver
          s.advanceTimeTo(1501, TimeUnit.MILLISECONDS);
          o.onComplete();
  
          InOrder inOrder = inOrder(subscriber);
          inOrder.verify(subscriber).onNext(2);
          inOrder.verify(subscriber).onNext(6);
          inOrder.verify(subscriber).onNext(7);
          inOrder.verify(subscriber).onComplete();
          inOrder.verifyNoMoreInteractions();
      }
  }
  