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.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class MaybeFlatMapNotificationTest extends RxJavaTest {
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Maybe.just(1)
                  .flatMap(Functions.justFunction(Maybe.just(1)),
                          Functions.justFunction(Maybe.just(1)), Functions.justSupplier(Maybe.just(1))));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeMaybe(new Function<Maybe<Integer>, MaybeSource<Integer>>() {
              @Override
              public MaybeSource<Integer> apply(Maybe<Integer> m) throws Exception {
                  return m
                          .flatMap(Functions.justFunction(Maybe.just(1)),
                                  Functions.justFunction(Maybe.just(1)), Functions.justSupplier(Maybe.just(1)));
              }
          });
      }
  
      @Test
      public void onSuccessNull() {
          Maybe.just(1)
          .flatMap(Functions.justFunction((Maybe<Integer>)null),
                  Functions.justFunction(Maybe.just(1)),
                  Functions.justSupplier(Maybe.just(1)))
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void onErrorNull() {
          TestObserverEx<Integer> to = Maybe.<Integer>error(new TestException())
          .flatMap(Functions.justFunction(Maybe.just(1)),
                  Functions.justFunction((Maybe<Integer>)null),
                  Functions.justSupplier(Maybe.just(1)))
          .to(TestHelper.<Integer>testConsumer())
          .assertFailure(CompositeException.class);
  
          List<Throwable> ce = TestHelper.compositeList(to.errors().get(0));
  
          TestHelper.assertError(ce, 0, TestException.class);
          TestHelper.assertError(ce, 1, NullPointerException.class);
      }
  
      @Test
      public void onCompleteNull() {
          Maybe.<Integer>empty()
          .flatMap(Functions.justFunction(Maybe.just(1)),
                  Functions.justFunction(Maybe.just(1)),
                  Functions.justSupplier((Maybe<Integer>)null))
          .test()
          .assertFailure(NullPointerException.class);
      }
  
      @Test
      public void onSuccessEmpty() {
          Maybe.just(1)
          .flatMap(Functions.justFunction(Maybe.<Integer>empty()),
                  Functions.justFunction(Maybe.just(1)),
                  Functions.justSupplier(Maybe.just(1)))
          .test()
          .assertResult();
      }
  
      @Test
      public void onSuccessError() {
          Maybe.just(1)
          .flatMap(Functions.justFunction(Maybe.<Integer>error(new TestException())),
                  Functions.justFunction((Maybe<Integer>)null),
                  Functions.justSupplier(Maybe.just(1)))
          .test()
          .assertFailure(TestException.class);
      }
  }
  