/*
*
* 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
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*/
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);
}
}