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   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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,
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   * See the License for the specific language governing permissions and
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  package com.datastax.dse.driver.internal.core.cql.reactive;
  
  import org.reactivestreams.Publisher;
  import org.reactivestreams.tck.PublisherVerification;
  import org.reactivestreams.tck.TestEnvironment;
  
  public class SimpleUnicastProcessorTckTest extends PublisherVerification<Integer> {
  
    public SimpleUnicastProcessorTckTest() {
      super(new TestEnvironment());
    }
  
    @Override
    public Publisher<Integer> createPublisher(long elements) {
      // The TCK usually requests between 0 and 20 items, or Long.MAX_VALUE.
      // Past 3 elements it never checks how many elements have been effectively produced,
      // so we can safely cap at, say, 20.
      int effective = (int) Math.min(elements, 20L);
      SimpleUnicastProcessor<Integer> processor = new SimpleUnicastProcessor<>();
      for (int i = 0; i < effective; i++) {
        processor.onNext(i);
      }
      processor.onComplete();
      return processor;
    }
  
    @Override
    public Publisher<Integer> createFailedPublisher() {
      SimpleUnicastProcessor<Integer> processor = new SimpleUnicastProcessor<>();
      // Since our publisher does not support multiple
      // subscriptions, we use that to create a failed publisher.
      processor.subscribe(new TestSubscriber<>());
      return processor;
    }
  }
  