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.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Predicate;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class ParallelFilterTest extends RxJavaTest {
  
      @Test
      public void subscriberCount() {
          ParallelFlowableTest.checkSubscriberCount(Flowable.range(1, 5).parallel()
          .filter(Functions.alwaysTrue()));
      }
  
      @Test
      public void doubleFilter() {
          Flowable.range(1, 10)
          .parallel()
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 2 == 0;
              }
          })
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  return v % 3 == 0;
              }
          })
          .sequential()
          .test()
          .assertResult(6);
      }
  
      @Test
      public void doubleError() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new ParallelInvalid()
              .filter(Functions.alwaysTrue())
              .sequential()
              .test()
              .assertFailure(TestException.class);
  
              assertFalse(errors.isEmpty());
              for (Throwable ex : errors) {
                  assertTrue(ex.toString(), ex.getCause() instanceof TestException);
              }
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void doubleError2() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
          try {
              new ParallelInvalid()
              .filter(Functions.alwaysTrue())
              .filter(Functions.alwaysTrue())
              .sequential()
              .test()
              .assertFailure(TestException.class);
  
              assertFalse(errors.isEmpty());
              for (Throwable ex : errors) {
                  assertTrue(ex.toString(), ex.getCause() instanceof TestException);
              }
          } finally {
              RxJavaPlugins.reset();
          }
      }
  
      @Test
      public void error() {
          Flowable.error(new TestException())
          .parallel()
          .filter(Functions.alwaysTrue())
          .sequential()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void predicateThrows() {
          Flowable.just(1)
          .parallel()
          .filter(new Predicate<Integer>() {
              @Override
              public boolean test(Integer v) throws Exception {
                  throw new TestException();
              }
          })
          .filter(Functions.alwaysTrue())
          .sequential()
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(f ->
              ParallelFlowable.fromArray(f)
              .filter(v -> true)
              .sequential()
          );
      }
  
      @Test
      public void doubleOnSubscribeConditional() {
          TestHelper.checkDoubleOnSubscribeFlowable(f ->
              ParallelFlowable.fromArray(f)
              .filter(v -> true)
              .filter(v -> true)
              .sequential()
          );
      }
  
      @Test
      public void conditionalFalseTrue() {
          Flowable.just(1)
          .parallel()
          .filter(v -> false)
          .filter(v -> true)
          .sequential()
          .test()
          .assertResult();
      }
  
      @Test
      public void conditionalTrueFalse() {
          Flowable.just(1)
          .parallel()
          .filter(v -> true)
          .filter(v -> false)
          .sequential()
          .test()
          .assertResult();
      }
  }
  