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.assertEquals;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.subjects.MaybeSubject;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeConcatArrayTest extends RxJavaTest {
  
      @Test
      public void cancel() {
          Maybe.concatArray(Maybe.just(1), Maybe.just(2))
          .take(1)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void cancelDelayError() {
          Maybe.concatArrayDelayError(Maybe.just(1), Maybe.just(2))
          .take(1)
          .test()
          .assertResult(1);
      }
  
      @Test
      public void backpressure() {
          TestSubscriber<Integer> ts = Maybe.concatArray(Maybe.just(1), Maybe.just(2))
          .test(0L);
  
          ts.assertEmpty();
  
          ts.request(1);
  
          ts.assertValue(1);
  
          ts.request(2);
  
          ts.assertResult(1, 2);
      }
  
      @Test
      public void backpressureDelayError() {
          TestSubscriber<Integer> ts = Maybe.concatArrayDelayError(Maybe.just(1), Maybe.just(2))
          .test(0L);
  
          ts.assertEmpty();
  
          ts.request(1);
  
          ts.assertValue(1);
  
          ts.request(2);
  
          ts.assertResult(1, 2);
      }
  
      @Test
      public void requestCancelRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final TestSubscriber<Integer> ts = Maybe.concatArray(Maybe.just(1), Maybe.just(2))
                      .test(0L);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.request(1);
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void requestCancelRaceDelayError() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              final TestSubscriber<Integer> ts = Maybe.concatArrayDelayError(Maybe.just(1), Maybe.just(2))
                      .test(0L);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      ts.cancel();
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      ts.request(1);
                  }
              };
  
              TestHelper.race(r1, r2);
          }
      }
  
      @Test
      public void errorAfterTermination() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              final MaybeObserver<?>[] o = { null };
              Maybe.concatArrayDelayError(Maybe.just(1),
                      Maybe.error(new IOException()),
              new Maybe<Integer>() {
                  @Override
                  protected void subscribeActual(MaybeObserver<? super Integer> observer) {
                      observer.onSubscribe(Disposable.empty());
                      observer.onSuccess(2);
                      o[0] = observer;
                  }
              })
              .test()
              .assertFailure(IOException.class, 1, 2);
  
              o[0].onError(new TestException());
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void noSubsequentSubscription() {
          final int[] calls = { 0 };
  
          Maybe<Integer> source = Maybe.create(new MaybeOnSubscribe<Integer>() {
              @Override
              public void subscribe(MaybeEmitter<Integer> s) throws Exception {
                  calls[0]++;
                  s.onSuccess(1);
              }
          });
  
          Maybe.concatArray(source, source).firstElement()
          .test()
          .assertResult(1);
  
          assertEquals(1, calls[0]);
      }
  
      @Test
      public void noSubsequentSubscriptionDelayError() {
          final int[] calls = { 0 };
  
          Maybe<Integer> source = Maybe.create(new MaybeOnSubscribe<Integer>() {
              @Override
              public void subscribe(MaybeEmitter<Integer> s) throws Exception {
                  calls[0]++;
                  s.onSuccess(1);
              }
          });
  
          Maybe.concatArrayDelayError(source, source).firstElement()
          .test()
          .assertResult(1);
  
          assertEquals(1, calls[0]);
      }
  
      @Test
      public void badRequest() {
          TestHelper.assertBadRequestReported(Maybe.concatArray(MaybeSubject.create(), MaybeSubject.create()));
      }
  
      @Test
      public void badRequestDelayError() {
          TestHelper.assertBadRequestReported(Maybe.concatArrayDelayError(MaybeSubject.create(), MaybeSubject.create()));
      }
  
      @Test
      public void mixed() {
          Maybe.concatArray(
                  Maybe.just(1),
                  Maybe.empty(),
                  Maybe.just(2),
                  Maybe.empty(),
                  Maybe.empty()
          )
          .test()
          .assertResult(1, 2);
      }
  
      @Test
      public void requestBeforeSuccess() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
          TestSubscriber<Integer> ts = Maybe.concatArray(ms, ms)
          .test();
  
          ts.assertEmpty();
  
          ms.onSuccess(1);
  
          ts.assertResult(1, 1);
      }
  
      @Test
      public void requestBeforeComplete() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
          TestSubscriber<Integer> ts = Maybe.concatArray(ms, ms)
          .test();
  
          ts.assertEmpty();
  
          ms.onComplete();
  
          ts.assertResult();
      }
  
      @Test
      public void requestBeforeSuccessDelayError() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
          TestSubscriber<Integer> ts = Maybe.concatArrayDelayError(ms, ms)
          .test();
  
          ts.assertEmpty();
  
          ms.onSuccess(1);
  
          ts.assertResult(1, 1);
      }
  
      @Test
      public void requestBeforeCompleteDelayError() {
          MaybeSubject<Integer> ms = MaybeSubject.create();
          TestSubscriber<Integer> ts = Maybe.concatArrayDelayError(ms, ms)
          .test();
  
          ts.assertEmpty();
  
          ms.onComplete();
  
          ts.assertResult();
      }
  }
  