code: /*
   * 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, 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 org.apache.datasketches.memory.internal;
  
  import static org.testng.Assert.assertFalse;
  import static org.testng.Assert.assertTrue;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.testng.annotations.Test;
  
  public class MemoryCleanerTest {
  
      @Test
      public void cleanerDeallocates() {
         SimpleDeallocator deallocator = new SimpleDeallocator();
         MemoryCleaner cleaner = new MemoryCleaner(this, deallocator);
         cleaner.clean();
         assertTrue(SimpleDeallocator.getHasRun());
      }
  
      @Test
      public void noDeallocation() {
          SimpleDeallocator deallocator = new SimpleDeallocator();
          new MemoryCleaner(this, deallocator);
          assertFalse(SimpleDeallocator.getHasRun());
      }
  
      static final class SimpleDeallocator implements Runnable {
          static final AtomicBoolean hasRun = new AtomicBoolean();
  
          SimpleDeallocator() {
              hasRun.set(false);
          }
  
          @Override
          public void run() {
              hasRun.compareAndSet(false, true);
          }
  
          public static Boolean getHasRun() {
              return hasRun.get();
          }
      }
  }
  