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.schedulers;
  
  import static org.junit.Assert.*;
  
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.Scheduler;
  import io.reactivex.rxjava3.core.Scheduler.Worker;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.internal.schedulers.NewThreadWorker;
  import io.reactivex.rxjava3.testsupport.SuppressUndeliverable;
  
  public class NewThreadSchedulerTest extends AbstractSchedulerConcurrencyTests {
  
      @Override
      protected Scheduler getScheduler() {
          return Schedulers.newThread();
      }
  
      @Test
      public final void handledErrorIsNotDeliveredToThreadHandler() throws InterruptedException {
          SchedulerTestHelper.handledErrorIsNotDeliveredToThreadHandler(getScheduler());
      }
  
      @Test
      @SuppressUndeliverable
      public void shutdownRejects() {
          final int[] calls = { 0 };
  
          Runnable r = new Runnable() {
              @Override
              public void run() {
                  calls[0]++;
              }
          };
  
          Scheduler s = getScheduler();
          Worker w = s.createWorker();
          w.dispose();
  
          assertTrue(w.isDisposed());
  
          assertEquals(Disposable.disposed(), w.schedule(r));
  
          assertEquals(Disposable.disposed(), w.schedule(r, 1, TimeUnit.SECONDS));
  
          assertEquals(Disposable.disposed(), w.schedulePeriodically(r, 1, 1, TimeUnit.SECONDS));
  
          NewThreadWorker actual = (NewThreadWorker)w;
  
          CompositeDisposable cd = new CompositeDisposable();
  
          actual.scheduleActual(r, 1, TimeUnit.SECONDS, cd);
  
          assertEquals(0, cd.size());
  
          assertEquals(0, calls[0]);
      }
  
      /**
       * Regression test to ensure there is no NPE when the worker has been disposed.
       * @throws Exception on error
       */
      @Test
      @SuppressUndeliverable
      public void npeRegression() throws Exception {
          Scheduler s = getScheduler();
          NewThreadWorker w = (NewThreadWorker) s.createWorker();
          w.dispose();
  
          //This method used to throw a NPE when the worker has been disposed and the parent is null
          w.scheduleActual(new Runnable() {
              @Override
              public void run() {
              }
          }, 0, TimeUnit.MILLISECONDS, null);
  
      }
  }
  