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);
}
}