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.completable;
  
  import static org.junit.Assert.*;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.functions.Action;
  import io.reactivex.rxjava3.observers.TestObserver;
  import io.reactivex.rxjava3.schedulers.Schedulers;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class CompletableAndThenCompletableTest extends RxJavaTest {
      @Test
      public void andThenCompletableCompleteComplete() {
          Completable.complete()
                  .andThen(Completable.complete())
                  .test()
                  .assertComplete();
      }
  
      @Test
      public void andThenCompletableCompleteError() {
          Completable.complete()
                  .andThen(Completable.error(new TestException("test")))
                  .to(TestHelper.testConsumer())
                  .assertNotComplete()
                  .assertNoValues()
                  .assertError(TestException.class)
                  .assertErrorMessage("test");
      }
  
      @Test
      public void andThenCompletableCompleteNever() {
          Completable.complete()
                  .andThen(Completable.never())
                  .test()
                  .assertNoValues()
                  .assertNoErrors()
                  .assertNotComplete();
      }
  
      @Test
      public void andThenCompletableErrorComplete() {
          Completable.error(new TestException("bla"))
                  .andThen(Completable.complete())
                  .to(TestHelper.testConsumer())
                  .assertNotComplete()
                  .assertNoValues()
                  .assertError(TestException.class)
                  .assertErrorMessage("bla");
      }
  
      @Test
      public void andThenCompletableErrorNever() {
          Completable.error(new TestException("bla"))
                  .andThen(Completable.never())
                  .to(TestHelper.testConsumer())
                  .assertNotComplete()
                  .assertNoValues()
                  .assertError(TestException.class)
                  .assertErrorMessage("bla");
      }
  
      @Test
      public void andThenCompletableErrorError() {
          Completable.error(new TestException("error1"))
                  .andThen(Completable.error(new TestException("error2")))
                  .to(TestHelper.testConsumer())
                  .assertNotComplete()
                  .assertNoValues()
                  .assertError(TestException.class)
                  .assertErrorMessage("error1");
      }
  
      @Test
      public void andThenCanceled() {
          final AtomicInteger completableRunCount = new AtomicInteger();
          Completable.fromRunnable(new Runnable() {
              @Override
              public void run() {
                  completableRunCount.incrementAndGet();
              }
          })
                  .andThen(Completable.complete())
                  .test(true)
                  .assertEmpty();
          assertEquals(0, completableRunCount.get());
      }
  
      @Test
      public void andThenFirstCancels() {
          final TestObserver<Void> to = new TestObserver<>();
          Completable.fromRunnable(new Runnable() {
              @Override
              public void run() {
                  to.dispose();
              }
          })
                  .andThen(Completable.complete())
                  .subscribe(to);
          to
                  .assertNotComplete()
                  .assertNoErrors();
      }
  
      @Test
      public void andThenSecondCancels() {
          final TestObserver<Void> to = new TestObserver<>();
          Completable.complete()
                  .andThen(Completable.fromRunnable(new Runnable() {
                      @Override
                      public void run() {
                          to.dispose();
                      }
                  }))
                  .subscribe(to);
          to
                  .assertNotComplete()
                  .assertNoErrors();
      }
  
      @Test
      public void andThenDisposed() {
          TestHelper.checkDisposed(Completable.complete()
                  .andThen(Completable.complete()));
      }
  
      @Test
      public void andThenNoInterrupt() throws InterruptedException {
          for (int k = 0; k < 100; k++) {
              final int count = 10;
              final CountDownLatch latch = new CountDownLatch(count);
              final boolean[] interrupted = {false};
  
              for (int i = 0; i < count; i++) {
                  Completable.complete()
                          .subscribeOn(Schedulers.io())
                          .observeOn(Schedulers.io())
                          .andThen(Completable.fromAction(new Action() {
                              @Override
                              public void run() throws Exception {
                                  try {
                                      Thread.sleep(30);
                                  } catch (InterruptedException e) {
                                      System.out.println("Interrupted! " + Thread.currentThread());
                                      interrupted[0] = true;
                                  }
                              }
                          }))
                          .subscribe(new Action() {
                              @Override
                              public void run() throws Exception {
                                  latch.countDown();
                              }
                          });
              }
  
              latch.await();
              assertFalse("The second Completable was interrupted!", interrupted[0]);
          }
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeCompletable(c -> c.andThen(c));
      }
  }
  