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.flowable;
  
  import static org.mockito.Mockito.*;
  
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  import org.reactivestreams.Publisher;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.schedulers.TestScheduler;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowableThrottleLatestTest extends RxJavaTest {
  
      @Test
      public void just() {
          Flowable.just(1)
          .throttleLatest(1, TimeUnit.MINUTES)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void range() {
          Flowable.range(1, 5)
          .throttleLatest(1, TimeUnit.MINUTES)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void rangeEmitLatest() {
          Flowable.range(1, 5)
          .throttleLatest(1, TimeUnit.MINUTES, true)
          .test()
          .assertResult(1, 5);
      }
  
      @Test
      public void error() {
          Flowable.error(new TestException())
          .throttleLatest(1, TimeUnit.MINUTES)
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Publisher<Object>>() {
              @Override
              public Publisher<Object> apply(Flowable<Object> f) throws Exception {
                  return f.throttleLatest(1, TimeUnit.MINUTES);
              }
          });
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(
                  Flowable.never()
                  .throttleLatest(1, TimeUnit.MINUTES)
          );
      }
  
      @Test
      public void normal() {
          TestScheduler sch = new TestScheduler();
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch).test();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(3);
  
          ts.assertValuesOnly(1);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3);
  
          pp.onNext(4);
  
          ts.assertValuesOnly(1, 3);
  
          pp.onNext(5);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3, 5);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3, 5);
  
          pp.onNext(6);
  
          ts.assertValuesOnly(1, 3, 5, 6);
  
          pp.onNext(7);
          pp.onComplete();
  
          ts.assertResult(1, 3, 5, 6);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertResult(1, 3, 5, 6);
      }
  
      @Test
      public void normalEmitLast() {
          TestScheduler sch = new TestScheduler();
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch, true).test();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(3);
  
          ts.assertValuesOnly(1);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3);
  
          pp.onNext(4);
  
          ts.assertValuesOnly(1, 3);
  
          pp.onNext(5);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3, 5);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3, 5);
  
          pp.onNext(6);
  
          ts.assertValuesOnly(1, 3, 5, 6);
  
          pp.onNext(7);
          pp.onComplete();
  
          ts.assertResult(1, 3, 5, 6, 7);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertResult(1, 3, 5, 6, 7);
      }
  
      @Test
      public void missingBackpressureExceptionFirst() throws Throwable {
          TestScheduler sch = new TestScheduler();
          Action onCancel = mock(Action.class);
  
          Flowable.just(1, 2)
          .doOnCancel(onCancel)
          .throttleLatest(1, TimeUnit.MINUTES, sch)
          .test(0)
          .assertFailure(MissingBackpressureException.class);
  
          verify(onCancel).run();
      }
  
      @Test
      public void missingBackpressureExceptionLatest() throws Throwable {
          TestScheduler sch = new TestScheduler();
          Action onCancel = mock(Action.class);
  
          TestSubscriber<Integer> ts = Flowable.just(1, 2)
          .concatWith(Flowable.<Integer>never())
          .doOnCancel(onCancel)
          .throttleLatest(1, TimeUnit.SECONDS, sch, true)
          .test(1);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertFailure(MissingBackpressureException.class, 1);
  
          verify(onCancel).run();
      }
  
      @Test
      public void missingBackpressureExceptionLatestComplete() throws Throwable {
          TestScheduler sch = new TestScheduler();
          Action onCancel = mock(Action.class);
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp
          .doOnCancel(onCancel)
          .throttleLatest(1, TimeUnit.SECONDS, sch, true)
          .test(1);
  
          pp.onNext(1);
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onComplete();
  
          ts.assertFailure(MissingBackpressureException.class, 1);
  
          verify(onCancel, never()).run();
      }
  
      @Test
      public void take() throws Throwable {
          Action onCancel = mock(Action.class);
  
          Flowable.range(1, 5)
          .doOnCancel(onCancel)
          .throttleLatest(1, TimeUnit.MINUTES)
          .take(1)
          .test()
          .assertResult(1);
  
          verify(onCancel).run();
      }
  
      @Test
      public void reentrantComplete() {
          TestScheduler sch = new TestScheduler();
          final PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      pp.onNext(2);
                  }
                  if (t == 2) {
                      pp.onComplete();
                  }
              }
          };
  
          pp.throttleLatest(1, TimeUnit.SECONDS, sch).subscribe(ts);
  
          pp.onNext(1);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertResult(1, 2);
      }
  
      /** Emit 1, 2, 3, then advance time by a second; 1 and 3 should end up in downstream, 2 should be dropped. */
      @Test
      public void onDroppedBasicNoEmitLast() {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .test();
  
          ts.assertEmpty();
          drops.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onNext(3);
  
          ts.assertValuesOnly(1);
          drops.assertValuesOnly(2);
  
          sch.advanceTimeBy(1, TimeUnit.SECONDS);
  
          ts.assertValuesOnly(1, 3);
          drops.assertValuesOnly(2);
  
          pp.onComplete();
  
          ts.assertResult(1, 3);
  
          drops.assertValuesOnly(2);
      }
  
      /** Emit 1, 2, 3; 1 should end up in downstream, 2, 3 should be dropped. */
      @Test
      public void onDroppedBasicNoEmitLastDropLast() {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .test();
  
          ts.assertEmpty();
          drops.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onNext(3);
  
          ts.assertValuesOnly(1);
          drops.assertValuesOnly(2);
  
          pp.onComplete();
  
          ts.assertResult(1);
  
          drops.assertValuesOnly(2, 3);
      }
  
      /** Emit 1, 2, 3; 1 and 3 should end up in downstream, 2 should be dropped. */
      @Test
      public void onDroppedBasicEmitLast() {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch, true, drops::onNext)
          .test();
  
          ts.assertEmpty();
          drops.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onNext(3);
  
          ts.assertValuesOnly(1);
          drops.assertValuesOnly(2);
  
          pp.onComplete();
  
          ts.assertResult(1, 3);
  
          drops.assertValuesOnly(2);
      }
  
      /** Emit 1, 2, 3; 3 should trigger an error to the downstream because 2 is dropped and the callback crashes. */
      @Test
      public void onDroppedBasicNoEmitLastFirstDropCrash() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriber<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, d -> {
              if (d == 2) {
                  throw new TestException("forced");
              }
          })
          .test();
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(3);
  
          ts.assertFailure(TestException.class, 1);
  
          verify(whenDisposed).run();
      }
  
      /**
       * Emit 1, 2, Error; the error should trigger the drop callback and crash it too,
       * downstream gets 1, composite(source, drop-crash).
       */
      @Test
      public void onDroppedBasicNoEmitLastOnErrorDropCrash() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriberEx<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, d -> { throw new TestException("forced " + d); })
          .subscribeWith(new TestSubscriberEx<>());
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onError(new TestException("source"));
  
          ts.assertFailure(CompositeException.class, 1);
  
          TestHelper.assertCompositeExceptions(ts, TestException.class, "source", TestException.class, "forced 2");
  
          verify(whenDisposed, never()).run();
      }
  
      /**
       * Emit 1, 2, 3; 3 should trigger a drop-crash for 2, which then would trigger the error path and drop-crash for 3,
       * the last item not delivered, downstream gets 1, composite(drop-crash 2, drop-crash 3).
       */
      @Test
      public void onDroppedBasicEmitLastOnErrorDropCrash() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriberEx<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, true, d -> { throw new TestException("forced " + d); })
          .subscribeWith(new TestSubscriberEx<>());
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(3);
  
          ts.assertFailure(CompositeException.class, 1);
  
          TestHelper.assertCompositeExceptions(ts, TestException.class, "forced 2", TestException.class, "forced 3");
  
          verify(whenDisposed).run();
      }
  
      /** Emit 1, complete; Downstream gets 1, complete, no drops. */
      @Test
      public void onDroppedBasicNoEmitLastNoLastToDrop() {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .test();
  
          ts.assertEmpty();
          drops.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onComplete();
  
          ts.assertResult(1);
          drops.assertEmpty();
      }
  
      /** Emit 1, error; Downstream gets 1, error, no drops. */
      @Test
      public void onDroppedErrorNoEmitLastNoLastToDrop() {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriber<Integer> ts = pp.throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .test();
  
          ts.assertEmpty();
          drops.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          pp.onError(new TestException());
  
          ts.assertFailure(TestException.class, 1);
          drops.assertEmpty();
      }
  
      /**
       * Emit 1, 2, complete; complete should crash drop, downstream gets 1, drop-crash 2.
       */
      @Test
      public void onDroppedHasLastNoEmitLastDropCrash() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriberEx<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, d -> { throw new TestException("forced " + d); })
          .subscribeWith(new TestSubscriberEx<>());
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          pp.onComplete();
  
          ts.assertFailureAndMessage(TestException.class, "forced 2", 1);
  
          verify(whenDisposed, never()).run();
      }
  
      /**
       * Emit 1, 2 then dispose the sequence; downstream gets 1, drop should get for 2.
       */
      @Test
      public void onDroppedDisposeDrops() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriberEx<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .subscribeWith(new TestSubscriberEx<>());
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          pp.onNext(2);
  
          ts.assertValuesOnly(1);
  
          ts.cancel();
  
          ts.assertValuesOnly(1);
          drops.assertValuesOnly(2);
  
          verify(whenDisposed).run();
      }
  
      /**
       * Emit 1 then dispose the sequence; downstream gets 1, drop should not get called.
       */
      @Test
      public void onDroppedDisposeNoDrops() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          TestSubscriberEx<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .subscribeWith(new TestSubscriberEx<>());
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertValuesOnly(1);
  
          ts.cancel();
  
          ts.assertValuesOnly(1);
          drops.assertEmpty();
  
          verify(whenDisposed).run();
      }
  
      /**
       * Emit 1, 2 then dispose the sequence; downstream gets 1, global error handler should get drop-crash 2.
       */
      @Test
      public void onDroppedDisposeCrashesDrop() throws Throwable {
          TestHelper.withErrorTracking(errors -> {
              PublishProcessor<Integer> pp =PublishProcessor.create();
  
              TestScheduler sch = new TestScheduler();
  
              Action whenDisposed = mock(Action.class);
  
              TestSubscriberEx<Integer> ts = pp
              .doOnCancel(whenDisposed)
              .throttleLatest(1, TimeUnit.SECONDS, sch, false, d -> { throw new TestException("forced " + d); })
              .subscribeWith(new TestSubscriberEx<>());
  
              ts.assertEmpty();
  
              pp.onNext(1);
  
              ts.assertValuesOnly(1);
  
              pp.onNext(2);
  
              ts.assertValuesOnly(1);
  
              ts.cancel();
  
              ts.assertValuesOnly(1);
  
              verify(whenDisposed).run();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class, "forced 2");
          });
      }
  
      /** Emit 1 but downstream is backpressured; downstream gets MBE, drops gets 1. */
      @Test
      public void onDroppedBackpressured() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          TestSubscriber<Object> drops = new TestSubscriber<>();
          drops.onSubscribe(EmptySubscription.INSTANCE);
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriber<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, drops::onNext)
          .test(0L);
  
          ts.assertEmpty();
          drops.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertFailure(MissingBackpressureException.class);
  
          drops.assertValuesOnly(1);
  
          verify(whenDisposed).run();
      }
  
      /** Emit 1 but downstream is backpressured; drop crashes, downstream gets composite(MBE, drop-crash 1). */
      @Test
      public void onDroppedBackpressuredDropCrash() throws Throwable {
          PublishProcessor<Integer> pp =PublishProcessor.create();
  
          TestScheduler sch = new TestScheduler();
  
          Action whenDisposed = mock(Action.class);
  
          TestSubscriberEx<Integer> ts = pp
          .doOnCancel(whenDisposed)
          .throttleLatest(1, TimeUnit.SECONDS, sch, false, d -> { throw new TestException("forced " + d); })
          .subscribeWith(new TestSubscriberEx<>(0L));
  
          ts.assertEmpty();
  
          pp.onNext(1);
  
          ts.assertFailure(CompositeException.class);
  
          TestHelper.assertCompositeExceptions(ts,
                  MissingBackpressureException.class, "Could not emit value due to lack of requests",
                  TestException.class, "forced 1");
  
          verify(whenDisposed).run();
      }
  }
  