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.maybe;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  
  import org.junit.Test;
  import org.reactivestreams.Subscription;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.internal.operators.maybe.MaybeMergeArray.MergeMaybeObserver;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.operators.QueueSubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.*;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class MaybeMergeArrayTest extends RxJavaTest {
  
      @Test
      public void normal() {
          TestSubscriberEx<Integer> ts = new TestSubscriberEx<Integer>().setInitialFusionMode(QueueFuseable.SYNC);
  
          Maybe.mergeArray(Maybe.just(1), Maybe.just(2))
          .subscribe(ts);
          ts
          .assertFuseable()
          .assertFusionMode(QueueFuseable.NONE)
          .assertResult(1, 2);
      }
  
      @Test
      public void fusedPollMixed() {
          TestSubscriberEx<Integer> ts = new TestSubscriberEx<Integer>().setInitialFusionMode(QueueFuseable.ANY);
  
          Maybe.mergeArray(Maybe.just(1), Maybe.<Integer>empty(), Maybe.just(2))
          .subscribe(ts);
          ts
          .assertFuseable()
          .assertFusionMode(QueueFuseable.ASYNC)
          .assertResult(1, 2);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void fusedEmptyCheck() {
          Maybe.mergeArray(Maybe.just(1), Maybe.<Integer>empty(), Maybe.just(2))
          .subscribe(new FlowableSubscriber<Integer>() {
              QueueSubscription<Integer> qs;
              @Override
              public void onSubscribe(Subscription s) {
                  qs = (QueueSubscription<Integer>)s;
  
                  assertEquals(QueueFuseable.ASYNC, qs.requestFusion(QueueFuseable.ANY));
              }
  
              @Override
              public void onNext(Integer value) {
                  assertFalse(qs.isEmpty());
  
                  qs.clear();
  
                  assertTrue(qs.isEmpty());
  
                  qs.cancel();
              }
  
              @Override
              public void onError(Throwable e) {
              }
  
              @Override
              public void onComplete() {
              }
          });
      }
  
      @Test
      public void cancel() {
          TestSubscriber<Integer> ts = new TestSubscriber<>(0L);
  
          Maybe.mergeArray(Maybe.just(1), Maybe.<Integer>empty(), Maybe.just(2))
          .subscribe(ts);
  
          ts.cancel();
          ts.request(10);
  
          ts.assertEmpty();
      }
  
      @Test
      public void firstErrors() {
          TestSubscriber<Integer> ts = new TestSubscriber<>(0L);
  
          Maybe.mergeArray(Maybe.<Integer>error(new TestException()), Maybe.<Integer>empty(), Maybe.just(2))
          .subscribe(ts);
  
          ts.assertFailure(TestException.class);
      }
  
      @Test
      public void errorFused() {
          TestSubscriberEx<Integer> ts = new TestSubscriberEx<Integer>().setInitialFusionMode(QueueFuseable.ANY);
  
          Maybe.mergeArray(Maybe.<Integer>error(new TestException()), Maybe.just(2))
          .subscribe(ts);
          ts
          .assertFuseable()
          .assertFusionMode(QueueFuseable.ASYNC)
          .assertFailure(TestException.class);
      }
  
      @Test
      public void errorRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              List<Throwable> errors = TestHelper.trackPluginErrors();
  
              try {
                  final PublishSubject<Integer> ps1 = PublishSubject.create();
                  final PublishSubject<Integer> ps2 = PublishSubject.create();
  
                  TestSubscriber<Integer> ts = Maybe.mergeArray(ps1.singleElement(), ps2.singleElement())
                  .test();
  
                  final TestException ex = new TestException();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          ps1.onError(ex);
                      }
                  };
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          ps2.onError(ex);
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  ts.assertFailure(Throwable.class);
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void mergeBadSource() {
          Maybe.mergeArray(new Maybe<Integer>() {
              @Override
              protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                  observer.onSubscribe(Disposable.empty());
                  observer.onSuccess(1);
                  observer.onSuccess(2);
                  observer.onSuccess(3);
              }
          }, Maybe.never())
          .test()
          .assertResult(1, 2);
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void smallOffer2Throws() {
          Maybe.mergeArray(Maybe.never(), Maybe.never())
          .subscribe(new FlowableSubscriber<Object>() {
  
              @SuppressWarnings("rawtypes")
              @Override
              public void onSubscribe(Subscription s) {
                  MergeMaybeObserver o = (MergeMaybeObserver)s;
  
                  try {
                      o.queue.offer(1, 2);
                      fail("Should have thrown");
                  } catch (UnsupportedOperationException ex) {
                      // expected
                  }
              }
  
              @Override
              public void onNext(Object t) {
              }
  
              @Override
              public void onError(Throwable t) {
              }
  
              @Override
              public void onComplete() {
              }
          });
      }
  
      @SuppressWarnings("unchecked")
      @Test
      public void largeOffer2Throws() {
          Maybe<Integer>[] a = new Maybe[1024];
          Arrays.fill(a, Maybe.never());
          Maybe.mergeArray(a)
          .subscribe(new FlowableSubscriber<Object>() {
  
              @SuppressWarnings("rawtypes")
              @Override
              public void onSubscribe(Subscription s) {
                  MergeMaybeObserver o = (MergeMaybeObserver)s;
  
                  try {
                      o.queue.offer(1, 2);
                      fail("Should have thrown");
                  } catch (UnsupportedOperationException ex) {
                      // expected
                  }
  
                  o.queue.drop();
              }
  
              @Override
              public void onNext(Object t) {
              }
  
              @Override
              public void onError(Throwable t) {
              }
  
              @Override
              public void onComplete() {
              }
          });
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(
                  Maybe.mergeArray(MaybeSubject.create(), MaybeSubject.create())
          );
      }
  
      @Test
      public void cancel2() {
          TestHelper.checkDisposed(Maybe.mergeArray(MaybeSubject.create(), MaybeSubject.create()));
      }
  
      @Test
      public void take() {
          Maybe.mergeArray(Maybe.just(1), Maybe.empty(), Maybe.just(2))
          .doOnSubscribe(s -> s.request(Long.MAX_VALUE))
          .take(1)
          .test()
          .assertResult(1);
      }
  }
  