content: /*
   *
   * 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.cassandra.gms;
  
  import java.util.Arrays;
  
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class ArrayBackedBoundedStatsTest {
  
      @Test
      public void test()
      {
          int size = 4;
  
          ArrayBackedBoundedStats bsd = new ArrayBackedBoundedStats(size);
          //check the values for an empty result
          assertEquals(0, bsd.mean(), 0.001d);
  
          bsd.add(1L); //this one falls out, over limit
          bsd.add(2L);
          bsd.add(3L);
          bsd.add(4L);
          bsd.add(5L);
  
          //verify that everything is in there
          long [] expected = new long[] {2,3,4,5};
          assertArrivalIntervals(bsd, expected);
  
          //check results
          assertEquals(3.5, bsd.mean(), 0.001d);
      }
  
      private void assertArrivalIntervals(ArrayBackedBoundedStats bsd, long [] expected)
      {
          Arrays.sort(expected);
          Arrays.sort(bsd.getArrivalIntervals());
          assertTrue(Arrays.equals(bsd.getArrivalIntervals(), expected));
  
      }
  
      @Test
      public void testMultipleRounds() throws Exception
      {
          int size = 5;
          ArrayBackedBoundedStats bsd = new ArrayBackedBoundedStats(size);
  
          for(long i=0; i <= 1000;i++)
          {
              bsd.add(i);
          }
  
          long [] expected = new long[] {1000,999,998,997, 996};
          assertArrivalIntervals(bsd, expected);
      }
  }
  