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.junit.Assert.*;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.junit.Test;
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class FlowableMergeWithMaybeTest extends RxJavaTest {
  
      @Test
      public void normal() {
          Flowable.range(1, 5)
          .mergeWith(Maybe.just(100))
          .test()
          .assertResult(1, 2, 3, 4, 5, 100);
      }
  
      @Test
      public void emptyOther() {
          Flowable.range(1, 5)
          .mergeWith(Maybe.<Integer>empty())
          .test()
          .assertResult(1, 2, 3, 4, 5);
      }
  
      @Test
      public void normalLong() {
          Flowable.range(1, 512)
          .mergeWith(Maybe.just(100))
          .test()
          .assertValueCount(513)
          .assertComplete();
      }
  
      @Test
      public void normalLongRequestExact() {
          Flowable.range(1, 512)
          .mergeWith(Maybe.just(100))
          .test(513)
          .assertValueCount(513)
          .assertComplete();
      }
  
      @Test
      public void take() {
          Flowable.range(1, 5)
          .mergeWith(Maybe.just(100))
          .take(3)
          .test()
          .assertResult(1, 2, 3);
      }
  
      @Test
      public void cancel() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
          final MaybeSubject<Integer> cs = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(cs).test();
  
          assertTrue(pp.hasSubscribers());
          assertTrue(cs.hasObservers());
  
          ts.cancel();
  
          assertFalse(pp.hasSubscribers());
          assertFalse(cs.hasObservers());
      }
  
      @Test
      public void normalBackpressured() {
          Flowable.range(1, 5).mergeWith(
                  Maybe.just(100)
          )
          .test(0L)
          .assertEmpty()
          .requestMore(2)
          .assertValues(100, 1)
          .requestMore(2)
          .assertValues(100, 1, 2, 3)
          .requestMore(2)
          .assertResult(100, 1, 2, 3, 4, 5);
      }
  
      @Test
      public void mainError() {
          Flowable.error(new TestException())
          .mergeWith(Maybe.just(100))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void otherError() {
          Flowable.never()
          .mergeWith(Maybe.error(new TestException()))
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void completeRace() {
          for (int i = 0; i < 10000; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
              final MaybeSubject<Integer> cs = MaybeSubject.create();
  
              TestSubscriber<Integer> ts = pp.mergeWith(cs).test();
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      pp.onNext(1);
                      pp.onComplete();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      cs.onSuccess(1);
                  }
              };
  
              TestHelper.race(r1, r2);
  
              ts.assertResult(1, 1);
          }
      }
  
      @Test
      public void onNextSlowPath() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
          final MaybeSubject<Integer> cs = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(cs).subscribeWith(new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      pp.onNext(2);
                  }
              }
          });
  
          pp.onNext(1);
          cs.onSuccess(3);
  
          pp.onNext(4);
          pp.onComplete();
  
          ts.assertResult(1, 2, 3, 4);
      }
  
      @Test
      public void onSuccessSlowPath() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
          final MaybeSubject<Integer> cs = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(cs).subscribeWith(new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      cs.onSuccess(2);
                  }
              }
          });
  
          pp.onNext(1);
  
          pp.onNext(3);
          pp.onComplete();
  
          ts.assertResult(1, 2, 3);
      }
  
      @Test
      public void onSuccessSlowPathBackpressured() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
          final MaybeSubject<Integer> cs = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(cs).subscribeWith(new TestSubscriber<Integer>(1) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      cs.onSuccess(2);
                  }
              }
          });
  
          pp.onNext(1);
  
          pp.onNext(3);
          pp.onComplete();
  
          ts.request(2);
          ts.assertResult(1, 2, 3);
      }
  
      @Test
      public void onSuccessFastPathBackpressuredRace() {
          for (int i = 0; i < 10000; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
              final MaybeSubject<Integer> cs = MaybeSubject.create();
  
              final TestSubscriber<Integer> ts = pp.mergeWith(cs).subscribeWith(new TestSubscriber<>(0));
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      cs.onSuccess(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.request(2);
                  }
              };
  
              TestHelper.race(r1, r2);
  
              pp.onNext(2);
              pp.onComplete();
  
              ts.assertResult(1, 2);
          }
      }
  
      @Test
      public void onErrorMainOverflow() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              final AtomicReference<Subscriber<?>> subscriber = new AtomicReference<>();
              TestSubscriber<Integer> ts = new Flowable<Integer>() {
                  @Override
                  protected void subscribeActual(Subscriber<? super Integer> s) {
                      s.onSubscribe(new BooleanSubscription());
                      subscriber.set(s);
                  }
              }
              .mergeWith(Maybe.<Integer>error(new IOException()))
              .test();
  
              subscriber.get().onError(new TestException());
  
              ts.assertFailure(IOException.class)
              ;
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void onErrorOtherOverflow() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              Flowable.error(new IOException())
              .mergeWith(Maybe.error(new TestException()))
              .test()
              .assertFailure(IOException.class)
              ;
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void onNextRequestRace() {
          for (int i = 0; i < 10000; i++) {
              final PublishProcessor<Integer> pp = PublishProcessor.create();
              final MaybeSubject<Integer> cs = MaybeSubject.create();
  
              final TestSubscriber<Integer> ts = pp.mergeWith(cs).test(0);
  
              pp.onNext(0);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      pp.onNext(1);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.request(3);
                  }
              };
  
              TestHelper.race(r1, r2);
  
              cs.onSuccess(1);
              pp.onComplete();
  
              ts.assertResult(0, 1, 1);
          }
      }
  
      @Test
      public void doubleOnSubscribeMain() {
          TestHelper.checkDoubleOnSubscribeFlowable(
                  new Function<Flowable<Object>, Publisher<Object>>() {
                      @Override
                      public Publisher<Object> apply(Flowable<Object> f)
                              throws Exception {
                          return f.mergeWith(Maybe.just(1));
                      }
                  }
          );
      }
  
      @Test
      public void noRequestOnError() {
          Flowable.empty()
          .mergeWith(Maybe.error(new TestException()))
          .test(0)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void drainExactRequestCancel() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
          final MaybeSubject<Integer> cs = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(cs)
                  .take(2)
                  .subscribeWith(new TestSubscriber<Integer>(2) {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      cs.onSuccess(2);
                  }
              }
          });
  
          pp.onNext(1);
  
          pp.onComplete();
  
          ts.request(2);
          ts.assertResult(1, 2);
      }
  
      @Test
      public void drainRequestWhenLimitReached() {
          final PublishProcessor<Integer> pp = PublishProcessor.create();
          final MaybeSubject<Integer> cs = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(cs)
                  .subscribeWith(new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  if (t == 1) {
                      for (int i = 0; i < Flowable.bufferSize() - 1; i++) {
                          pp.onNext(i + 2);
                      }
                  }
              }
          });
  
          cs.onSuccess(1);
  
          pp.onComplete();
  
          ts.request(2);
          ts.assertValueCount(Flowable.bufferSize());
          ts.assertComplete();
      }
  
      @Test
      public void cancelOtherOnMainError() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(ms).test();
  
          assertTrue(pp.hasSubscribers());
          assertTrue(ms.hasObservers());
  
          pp.onError(new TestException());
  
          ts.assertFailure(TestException.class);
  
          assertFalse("main has observers!", pp.hasSubscribers());
          assertFalse("other has observers", ms.hasObservers());
      }
  
      @Test
      public void cancelMainOnOtherError() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = pp.mergeWith(ms).test();
  
          assertTrue(pp.hasSubscribers());
          assertTrue(ms.hasObservers());
  
          ms.onError(new TestException());
  
          ts.assertFailure(TestException.class);
  
          assertFalse("main has observers!", pp.hasSubscribers());
          assertFalse("other has observers", ms.hasObservers());
      }
  
      @Test
      public void undeliverableUponCancel() {
          TestHelper.checkUndeliverableUponCancel(new FlowableConverter<Integer, Flowable<Integer>>() {
              @Override
              public Flowable<Integer> apply(Flowable<Integer> upstream) {
                  return upstream.mergeWith(Maybe.just(1).hide());
              }
          });
      }
  
      @Test
      public void drainMoreWorkBeforeCancel() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
  
          TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          Flowable.range(1, 5).mergeWith(ms)
          .doOnNext(v -> {
              if (v == 1) {
                  ms.onSuccess(6);
                  ts.cancel();
              }
          })
          .subscribe(ts);
  
          ts.assertValuesOnly(1);
      }
  }
  