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 io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.util.CrashingMappedIterable;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class MaybeZipIterableTest extends RxJavaTest {
  
      final Function<Object[], Object> addString = new Function<Object[], Object>() {
          @Override
          public Object apply(Object[] a) throws Exception {
              return Arrays.toString(a);
          }
      };
  
      @Test
      public void firstError() {
          Maybe.zip(Arrays.asList(Maybe.error(new TestException()), Maybe.just(1)), addString)
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void secondError() {
          Maybe.zip(Arrays.asList(Maybe.just(1), Maybe.<Integer>error(new TestException())), addString)
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void dispose() {
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          TestObserver<Object> to = Maybe.zip(Arrays.asList(pp.singleElement(), pp.singleElement()), addString)
          .test();
  
          assertTrue(pp.hasSubscribers());
  
          to.dispose();
  
          assertFalse(pp.hasSubscribers());
      }
  
      @Test
      public void zipperThrows() {
          Maybe.zip(Arrays.asList(Maybe.just(1), Maybe.just(2)), new Function<Object[], Object>() {
              @Override
              public Object apply(Object[] b) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class);
      }
  
      @Test
      public void zipperReturnsNull() {
          Maybe.zip(Arrays.asList(Maybe.just(1), Maybe.just(2)), new Function<Object[], Object>() {
              @Override
              public Object apply(Object[] a) throws Exception {
                  return null;
              }
          })
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void middleError() {
          PublishProcessor<Integer> pp0 = PublishProcessor.create();
          PublishProcessor<Integer> pp1 = PublishProcessor.create();
  
          TestObserver<Object> to = Maybe.zip(
                  Arrays.asList(pp0.singleElement(), pp1.singleElement(), pp0.singleElement()), addString)
          .test();
  
          pp1.onError(new TestException());
  
          assertFalse(pp0.hasSubscribers());
  
          to.assertFailure(TestException.class);
      }
  
      @Test
      public void innerErrorRace() {
          for (int i = 0; i < TestHelper.RACE_DEFAULT_LOOPS; i++) {
              List<Throwable> errors = TestHelper.trackPluginErrors();
              try {
                  final PublishProcessor<Integer> pp0 = PublishProcessor.create();
                  final PublishProcessor<Integer> pp1 = PublishProcessor.create();
  
                  final TestObserver<Object> to = Maybe.zip(
                          Arrays.asList(pp0.singleElement(), pp1.singleElement()), addString)
                  .test();
  
                  final TestException ex = new TestException();
  
                  Runnable r1 = new Runnable() {
                      @Override
                      public void run() {
                          pp0.onError(ex);
                      }
                  };
  
                  Runnable r2 = new Runnable() {
                      @Override
                      public void run() {
                          pp1.onError(ex);
                      }
                  };
  
                  TestHelper.race(r1, r2);
  
                  to.assertFailure(TestException.class);
  
                  if (!errors.isEmpty()) {
                      TestHelper.assertUndeliverable(errors, 0, TestException.class);
                  }
              } finally {
                  RxJavaPlugins.reset();
              }
          }
      }
  
      @Test
      public void iteratorThrows() {
          Maybe.zip(new CrashingMappedIterable<>(1, 100, 100, new Function<Integer, Maybe<Integer>>() {
              @Override
              public Maybe<Integer> apply(Integer v) throws Exception {
                  return Maybe.just(v);
              }
          }), addString)
          .to(TestHelper.<Object>testConsumer())
          .assertFailureAndMessage(TestException.class, "iterator()");
      }
  
      @Test
      public void hasNextThrows() {
          Maybe.zip(new CrashingMappedIterable<>(100, 20, 100, new Function<Integer, Maybe<Integer>>() {
              @Override
              public Maybe<Integer> apply(Integer v) throws Exception {
                  return Maybe.just(v);
              }
          }), addString)
          .to(TestHelper.<Object>testConsumer())
          .assertFailureAndMessage(TestException.class, "hasNext()");
      }
  
      @Test
      public void nextThrows() {
          Maybe.zip(new CrashingMappedIterable<>(100, 100, 5, new Function<Integer, Maybe<Integer>>() {
              @Override
              public Maybe<Integer> apply(Integer v) throws Exception {
                  return Maybe.just(v);
              }
          }), addString)
          .to(TestHelper.<Object>testConsumer())
          .assertFailureAndMessage(TestException.class, "next()");
      }
  
      @Test(expected = NullPointerException.class)
      public void zipIterableOneIsNull() {
          Maybe.zip(Arrays.asList(null, Maybe.just(1)), new Function<Object[], Object>() {
              @Override
              public Object apply(Object[] v) {
                  return 1;
              }
          })
          .blockingGet();
      }
  
      @Test(expected = NullPointerException.class)
      public void zipIterableTwoIsNull() {
          Maybe.zip(Arrays.asList(Maybe.just(1), null), new Function<Object[], Object>() {
              @Override
              public Object apply(Object[] v) {
                  return 1;
              }
          })
          .blockingGet();
      }
  
      @Test
      public void singleSourceZipperReturnsNull() {
          Maybe.zipArray(Functions.justFunction(null), Maybe.just(1))
          .to(TestHelper.<Object>testConsumer())
          .assertFailureAndMessage(NullPointerException.class, "The zipper returned a null value");
      }
  
      @Test
      public void maybeSourcesInIterable() {
          MaybeSource<Integer> source = new MaybeSource<Integer>() {
              @Override
              public void subscribe(MaybeObserver<? super Integer> observer) {
                  Maybe.just(1).subscribe(observer);
              }
          };
  
          Maybe.zip(Arrays.asList(source, source), new Function<Object[], Integer>() {
              @Override
              public Integer apply(Object[] t) throws Throwable {
                  return 2;
              }
          })
          .test()
          .assertResult(2);
      }
  }
  