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 java.util.concurrent.*;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeMergeTest extends RxJavaTest {
  
      @Test
      public void delayErrorWithMaxConcurrency() {
          Maybe.mergeDelayError(
                  Flowable.just(Maybe.just(1), Maybe.just(2), Maybe.just(3)), 1)
          .test()
          .assertResult(1, 2, 3);
      }
  
      @Test
      public void delayErrorWithMaxConcurrencyError() {
          Maybe.mergeDelayError(
                  Flowable.just(Maybe.just(1), Maybe.<Integer>error(new TestException()), Maybe.just(3)), 1)
          .test()
          .assertFailure(TestException.class, 1, 3);
      }
  
      @Test
      public void delayErrorWithMaxConcurrencyAsync() {
          final AtomicInteger count = new AtomicInteger();
          @SuppressWarnings("unchecked")
          Maybe<Integer>[] sources = new Maybe[3];
          for (int i = 0; i < 3; i++) {
              final int j = i + 1;
              sources[i] = Maybe.fromCallable(new Callable<Integer>() {
                  @Override
                  public Integer call() throws Exception {
                      return count.incrementAndGet() - j;
                  }
              })
              .subscribeOn(Schedulers.io());
          }
  
          for (int i = 0; i < 1000; i++) {
              count.set(0);
              Maybe.mergeDelayError(
                      Flowable.fromArray(sources), 1)
              .test()
              .awaitDone(5, TimeUnit.SECONDS)
              .assertResult(0, 0, 0);
          }
      }
  
      @Test
      public void delayErrorWithMaxConcurrencyAsyncError() {
          final AtomicInteger count = new AtomicInteger();
          @SuppressWarnings("unchecked")
          Maybe<Integer>[] sources = new Maybe[3];
          for (int i = 0; i < 3; i++) {
              final int j = i + 1;
              sources[i] = Maybe.fromCallable(new Callable<Integer>() {
                  @Override
                  public Integer call() throws Exception {
                      return count.incrementAndGet() - j;
                  }
              })
              .subscribeOn(Schedulers.io());
          }
          sources[1] = Maybe.fromCallable(new Callable<Integer>() {
              @Override
              public Integer call() throws Exception {
                  throw new TestException("" + count.incrementAndGet());
              }
          })
          .subscribeOn(Schedulers.io());
  
          for (int i = 0; i < 1000; i++) {
              count.set(0);
              Maybe.mergeDelayError(
                      Flowable.fromArray(sources), 1)
              .to(TestHelper.<Integer>testConsumer())
              .awaitDone(5, TimeUnit.SECONDS)
              .assertFailureAndMessage(TestException.class, "2", 0, 0);
          }
      }
  
      @Test
      public void scalar() {
          Maybe.mergeDelayError(
                  Flowable.just(Maybe.just(1)))
          .test()
          .assertResult(1);
      }
  }
  