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.subscribers;
  
  import static org.junit.Assert.assertTrue;
  
  import java.util.List;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.disposables.*;
  import io.reactivex.rxjava3.exceptions.TestException;
  import io.reactivex.rxjava3.internal.subscriptions.BooleanSubscription;
  import io.reactivex.rxjava3.internal.util.EmptyComponent;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  import io.reactivex.rxjava3.testsupport.TestHelper;
  
  public class EmptyComponentTest extends RxJavaTest {
  
      @Test
      public void normal() {
          List<Throwable> errors = TestHelper.trackPluginErrors();
  
          try {
              TestHelper.checkEnum(EmptyComponent.class);
  
              EmptyComponent c = EmptyComponent.INSTANCE;
  
              assertTrue(c.isDisposed());
  
              c.request(10);
  
              c.request(-10);
  
              Disposable d = Disposable.empty();
  
              c.onSubscribe(d);
  
              assertTrue(d.isDisposed());
  
              BooleanSubscription s = new BooleanSubscription();
  
              c.onSubscribe(s);
  
              assertTrue(s.isCancelled());
  
              c.onNext(null);
  
              c.onNext(1);
  
              c.onComplete();
  
              c.onError(new TestException());
  
              c.onSuccess(2);
  
              c.cancel();
  
              TestHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaPlugins.reset();
          }
      }
  }
  