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.observable;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.Observable;
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Consumer;
  import io.reactivex.rxjava3.internal.functions.Functions;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.operators.QueueFuseable;
  import io.reactivex.rxjava3.subjects.UnicastSubject;
  import io.reactivex.rxjava3.testsupport.*;
  
  public class ObservableDoAfterNextTest extends RxJavaTest {
  
      final List<Integer> values = new ArrayList<>();
  
      final Consumer<Integer> afterNext = new Consumer<Integer>() {
          @Override
          public void accept(Integer e) throws Exception {
              values.add(-e);
          }
      };
  
      final TestObserver<Integer> to = new TestObserver<Integer>() {
          @Override
          public void onNext(Integer t) {
              super.onNext(t);
              ObservableDoAfterNextTest.this.values.add(t);
          }
      };
  
      @Test
      public void just() {
          Observable.just(1)
          .doAfterNext(afterNext)
          .subscribeWith(to)
          .assertResult(1);
  
          assertEquals(Arrays.asList(1, -1), values);
      }
  
      @Test
      public void justHidden() {
          Observable.just(1)
          .hide()
          .doAfterNext(afterNext)
          .subscribeWith(to)
          .assertResult(1);
  
          assertEquals(Arrays.asList(1, -1), values);
      }
  
      @Test
      public void range() {
          Observable.range(1, 5)
          .doAfterNext(afterNext)
          .subscribeWith(to)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(1, -1, 2, -2, 3, -3, 4, -4, 5, -5), values);
      }
  
      @Test
      public void error() {
          Observable.<Integer>error(new TestException())
          .doAfterNext(afterNext)
          .subscribeWith(to)
          .assertFailure(TestException.class);
  
          assertTrue(values.isEmpty());
      }
  
      @Test
      public void empty() {
          Observable.<Integer>empty()
          .doAfterNext(afterNext)
          .subscribeWith(to)
          .assertResult();
  
          assertTrue(values.isEmpty());
      }
  
      @Test
      public void syncFused() {
          TestObserverEx<Integer> to0 = new TestObserverEx<>(QueueFuseable.SYNC);
  
          Observable.range(1, 5)
          .doAfterNext(afterNext)
          .subscribe(to0);
  
          to0.assertFusionMode(QueueFuseable.SYNC)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(-1, -2, -3, -4, -5), values);
      }
  
      @Test
      public void asyncFusedRejected() {
          TestObserverEx<Integer> to0 = new TestObserverEx<>(QueueFuseable.ASYNC);
  
          Observable.range(1, 5)
          .doAfterNext(afterNext)
          .subscribe(to0);
  
          to0.assertFusionMode(QueueFuseable.NONE)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(-1, -2, -3, -4, -5), values);
      }
  
      @Test
      public void asyncFused() {
          TestObserverEx<Integer> to0 = new TestObserverEx<>(QueueFuseable.ASYNC);
  
          UnicastSubject<Integer> us = UnicastSubject.create();
  
          TestHelper.emit(us, 1, 2, 3, 4, 5);
  
          us
          .doAfterNext(afterNext)
          .subscribe(to0);
  
          to0.assertFusionMode(QueueFuseable.ASYNC)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(-1, -2, -3, -4, -5), values);
      }
  
      @Test
      public void justConditional() {
          Observable.just(1)
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribeWith(to)
          .assertResult(1);
  
          assertEquals(Arrays.asList(1, -1), values);
      }
  
      @Test
      public void rangeConditional() {
          Observable.range(1, 5)
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribeWith(to)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(1, -1, 2, -2, 3, -3, 4, -4, 5, -5), values);
      }
  
      @Test
      public void errorConditional() {
          Observable.<Integer>error(new TestException())
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribeWith(to)
          .assertFailure(TestException.class);
  
          assertTrue(values.isEmpty());
      }
  
      @Test
      public void emptyConditional() {
          Observable.<Integer>empty()
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribeWith(to)
          .assertResult();
  
          assertTrue(values.isEmpty());
      }
  
      @Test
      public void syncFusedConditional() {
          TestObserverEx<Integer> to0 = new TestObserverEx<>(QueueFuseable.SYNC);
  
          Observable.range(1, 5)
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribe(to0);
  
          to0.assertFusionMode(QueueFuseable.SYNC)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(-1, -2, -3, -4, -5), values);
      }
  
      @Test
      public void asyncFusedRejectedConditional() {
          TestObserverEx<Integer> to0 = new TestObserverEx<>(QueueFuseable.ASYNC);
  
          Observable.range(1, 5)
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribe(to0);
  
          to0.assertFusionMode(QueueFuseable.NONE)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(-1, -2, -3, -4, -5), values);
      }
  
      @Test
      public void asyncFusedConditional() {
          TestObserverEx<Integer> to0 = new TestObserverEx<>(QueueFuseable.ASYNC);
  
          UnicastSubject<Integer> us = UnicastSubject.create();
  
          TestHelper.emit(us, 1, 2, 3, 4, 5);
  
          us
          .doAfterNext(afterNext)
          .filter(Functions.alwaysTrue())
          .subscribe(to0);
  
          to0.assertFusionMode(QueueFuseable.ASYNC)
          .assertResult(1, 2, 3, 4, 5);
  
          assertEquals(Arrays.asList(-1, -2, -3, -4, -5), values);
      }
  
      @Test
      public void consumerThrows() {
          Observable.just(1, 2)
          .doAfterNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer e) throws Exception {
                  throw new TestException();
              }
          })
          .test()
          .assertFailure(TestException.class, 1);
      }
  
      @Test
      public void consumerThrowsConditional() {
          Observable.just(1, 2)
          .doAfterNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer e) throws Exception {
                  throw new TestException();
              }
          })
          .filter(Functions.alwaysTrue())
          .test()
          .assertFailure(TestException.class, 1);
      }
  
      @Test
      public void consumerThrowsConditional2() {
          Observable.just(1, 2).hide()
          .doAfterNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer e) throws Exception {
                  throw new TestException();
              }
          })
          .filter(Functions.alwaysTrue())
          .test()
          .assertFailure(TestException.class, 1);
      }
  }
  