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.processors;
  
  import static org.junit.Assert.*;
  
  import org.junit.Test;
  
  import io.reactivex.rxjava3.core.RxJavaTest;
  import io.reactivex.rxjava3.internal.util.ExceptionHelper;
  
  public abstract class FlowableProcessorTest<T>  extends RxJavaTest {
  
      protected abstract FlowableProcessor<T> create();
  
      @Test
      public void onNextNull() {
          FlowableProcessor<T> p = create();
  
          try {
              p.onNext(null);
              fail("No NullPointerException thrown");
          } catch (NullPointerException ex) {
              assertEquals(ExceptionHelper.nullWarning("onNext called with a null value."), ex.getMessage());
          }
  
          p.test().assertEmpty().cancel();
      }
  
      @Test
      public void onErrorNull() {
          FlowableProcessor<T> p = create();
  
          try {
              p.onError(null);
              fail("No NullPointerException thrown");
          } catch (NullPointerException ex) {
              assertEquals(ExceptionHelper.nullWarning("onError called with a null Throwable."), ex.getMessage());
          }
  
          p.test().assertEmpty().cancel();
      }
  }
  