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.flowable;
  
  import org.junit.Test;
  import org.reactivestreams.*;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.internal.operators.flowable.FlowableMapNotification.MapNotificationSubscriber;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.processors.PublishProcessor;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class FlowableMapNotificationTest extends RxJavaTest {
      @Test
      public void just() {
          TestSubscriber<Object> ts = new TestSubscriber<>();
          Flowable.just(1)
          .flatMap(
                  new Function<Integer, Flowable<Object>>() {
                      @Override
                      public Flowable<Object> apply(Integer item) {
                          return Flowable.just((Object)(item + 1));
                      }
                  },
                  new Function<Throwable, Flowable<Object>>() {
                      @Override
                      public Flowable<Object> apply(Throwable e) {
                          return Flowable.error(e);
                      }
                  },
                  new Supplier<Flowable<Object>>() {
                      @Override
                      public Flowable<Object> get() {
                          return Flowable.never();
                      }
                  }
          ).subscribe(ts);
  
          ts.assertNoErrors();
          ts.assertNotComplete();
          ts.assertValue(2);
      }
  
      @Test
      public void backpressure() {
          TestSubscriber<Object> ts = TestSubscriber.create(0L);
  
          new FlowableMapNotification<>(Flowable.range(1, 3),
                  new Function<Integer, Integer>() {
                      @Override
                      public Integer apply(Integer item) {
                          return item + 1;
                      }
                  },
                  new Function<Throwable, Integer>() {
                      @Override
                      public Integer apply(Throwable e) {
                          return 0;
                      }
                  },
                  new Supplier<Integer>() {
                      @Override
                      public Integer get() {
                          return 5;
                      }
                  }
          ).subscribe(ts);
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(3);
  
          ts.assertValues(2, 3, 4);
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(1);
  
          ts.assertValues(2, 3, 4, 5);
          ts.assertNoErrors();
          ts.assertComplete();
      }
  
      @Test
      public void noBackpressure() {
          TestSubscriber<Object> ts = TestSubscriber.create(0L);
  
          PublishProcessor<Integer> pp = PublishProcessor.create();
  
          new FlowableMapNotification<>(pp,
                  new Function<Integer, Integer>() {
                      @Override
                      public Integer apply(Integer item) {
                          return item + 1;
                      }
                  },
                  new Function<Throwable, Integer>() {
                      @Override
                      public Integer apply(Throwable e) {
                          return 0;
                      }
                  },
                  new Supplier<Integer>() {
                      @Override
                      public Integer get() {
                          return 5;
                      }
                  }
          ).subscribe(ts);
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          pp.onNext(1);
          pp.onNext(2);
          pp.onNext(3);
          pp.onComplete();
  
          ts.assertNoValues();
          ts.assertNoErrors();
          ts.assertNotComplete();
  
          ts.request(1);
  
          ts.assertValue(0);
          ts.assertNoErrors();
          ts.assertComplete();
  
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(new Flowable<Integer>() {
              @SuppressWarnings({ "rawtypes", "unchecked" })
              @Override
              protected void subscribeActual(Subscriber<? super Integer> subscriber) {
                  MapNotificationSubscriber mn = new MapNotificationSubscriber(
                          subscriber,
                          Functions.justFunction(Flowable.just(1)),
                          Functions.justFunction(Flowable.just(2)),
                          Functions.justSupplier(Flowable.just(3))
                  );
                  mn.onSubscribe(new BooleanSubscription());
              }
          });
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Integer>>() {
              @Override
              public Flowable<Integer> apply(Flowable<Object> f) throws Exception {
                  return f.flatMap(
                          Functions.justFunction(Flowable.just(1)),
                          Functions.justFunction(Flowable.just(2)),
                          Functions.justSupplier(Flowable.just(3))
                  );
              }
          });
      }
  
      @Test
      public void onErrorCrash() {
          TestSubscriberEx<Integer> ts = Flowable.<Integer>error(new TestException("Outer"))
          .flatMap(Functions.justFunction(Flowable.just(1)),
                  new Function<Throwable, Publisher<Integer>>() {
                      @Override
                      public Publisher<Integer> apply(Throwable t) throws Exception {
                          throw new TestException("Inner");
                      }
                  },
                  Functions.justSupplier(Flowable.just(3)))
          .to(TestHelper.<Integer>testConsumer())
          .assertFailure(CompositeException.class);
  
          TestHelper.assertError(ts, 0, TestException.class, "Outer");
          TestHelper.assertError(ts, 1, TestException.class, "Inner");
      }
  }
  