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 static org.junit.Assert.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.subjects.SingleSubject;
  import io.reactivex.rxjava3.subscribers.TestSubscriber;
  
  public class FlowableConcatWithSingleTest extends RxJavaTest {
  
      @Test
      public void normal() {
          final TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          Flowable.range(1, 5)
          .concatWith(Single.just(100))
          .subscribe(ts);
  
          ts.assertResult(1, 2, 3, 4, 5, 100);
      }
  
      @Test
      public void backpressure() {
          Flowable.range(1, 5)
          .concatWith(Single.just(100))
          .test(0)
          .assertEmpty()
          .requestMore(3)
          .assertValues(1, 2, 3)
          .requestMore(2)
          .assertValues(1, 2, 3, 4, 5)
          .requestMore(1)
          .assertResult(1, 2, 3, 4, 5, 100);
      }
  
      @Test
      public void mainError() {
          final TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          Flowable.<Integer>error(new TestException())
          .concatWith(Single.just(100))
          .subscribe(ts);
  
          ts.assertFailure(TestException.class);
      }
  
      @Test
      public void otherError() {
          final TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          Flowable.range(1, 5)
          .concatWith(Single.<Integer>error(new TestException()))
          .subscribe(ts);
  
          ts.assertFailure(TestException.class, 1, 2, 3, 4, 5);
      }
  
      @Test
      public void takeMain() {
          final TestSubscriber<Integer> ts = new TestSubscriber<>();
  
          Flowable.range(1, 5)
          .concatWith(Single.just(100))
          .take(3)
          .subscribe(ts);
  
          ts.assertResult(1, 2, 3);
      }
  
      @Test
      public void cancelOther() {
          SingleSubject<Object> other = SingleSubject.create();
  
          TestSubscriber<Object> ts = Flowable.empty()
                  .concatWith(other)
                  .test();
  
          assertTrue(other.hasObservers());
  
          ts.cancel();
  
          assertFalse(other.hasObservers());
      }
  
  }
  