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.parallel;
  
  import static org.junit.Assert.*;
  
  import java.io.IOException;
  import java.util.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.BiFunction;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ParallelReduceFullTest extends RxJavaTest {
  
      @Test
      public void cancel() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestSubscriber<Integer> ts = pp
          .parallel()
          .reduce(new BiFunction<Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer a, Integer b) throws Exception {
                  return a + b;
              }
          })
          .test();
  
          assertTrue(pp.hasSubscribers());
  
          ts.cancel();
  
          assertFalse(pp.hasSubscribers());
      }
  
      @Test
      public void error() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          try {
              Flowable.<Integer>error(new TestException())
              .parallel()
              .reduce(new BiFunction<Integer, Integer, Integer>() {
                  @Override
                  public Integer apply(Integer a, Integer b) throws Exception {
                      return a + b;
                  }
              })
              .test()
              .assertFailure(TestException.class);
  
              assertTrue(errors.isEmpty());
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void error2() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          try {
              ParallelFlowable.fromArray(Flowable.<Integer>error(new IOException()), Flowable.<Integer>error(new TestException()))
              .reduce(new BiFunction<Integer, Integer, Integer>() {
                  @Override
                  public Integer apply(Integer a, Integer b) throws Exception {
                      return a + b;
                  }
              })
              .test()
              .assertFailure(IOException.class);
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void empty() {
          Flowable.<Integer>empty()
          .parallel()
          .reduce(new BiFunction<Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer a, Integer b) throws Exception {
                  return a + b;
              }
          })
          .test()
          .assertResult();
      }
  
      @Test
      public void doubleError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new ParallelInvalid()
              .reduce(new BiFunction<Object, Object, Object>() {
                  @Override
                  public Object apply(Object a, Object b) throws Exception {
                      return "" + a + b;
                  }
              })
              .test()
              .assertFailure(TestException.class);
  
              assertFalse(errors.isEmpty());
              for (Throwable ex : errors) {
                  assertTrue(ex.toString(), ex.getCause() instanceof TestException);
              }
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void reducerCrash() {
          Flowable.range(1, 4)
          .parallel(2)
          .reduce(new BiFunction<Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer a, Integer b) throws Exception {
                  if (b == 3) {
                      throw new TestException();
                  }
                  return a + b;
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void reducerCrash2() {
          Flowable.range(1, 4)
          .parallel(2)
          .reduce(new BiFunction<Integer, Integer, Integer>() {
              @Override
              public Integer apply(Integer a, Integer b) throws Exception {
                  if (a == 1 + 3) {
                      throw new TestException();
                  }
                  return a + b;
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeParallelToFlowable(
                  pf -> pf.reduce((a, b) -> a)
          );
      }
  }
  