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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.statistics;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
/**
* Some low level checking of the histograms.
*
* @author Steinar Knutsen
*/
public class HistogramTestCase {
@Test
public void testFindBucket() {
Limits l = new Limits();
double[] thresholds = {.5, 1.0, 5.0};
double[] value = {.5, .5};
l.addAxis("latency", thresholds);
thresholds = new double[] {500.0, 1000.0, 5000.0};
l.addAxis("size", thresholds);
Histogram h = new Histogram(l);
assertEquals("latency,size ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 0.5 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 1.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 5.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0))",
h.toString());
h.put(value);
assertEquals("latency,size ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 0.5 ((1) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 1.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 5.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0))",
h.toString());
}
@Test
public void testMerge() {
Limits l = new Limits();
double[] thresholds = {.5, 1.0, 5.0};
double[] value = {.75};
l.addAxis("latency", thresholds);
Histogram h = new Histogram(l);
Histogram h2 = new Histogram(l);
h.put(value);
h.put(value);
h2.put(value);
h2.merge(h);
assertEquals("(0) < 0.5 (3) < 1.0 (0) < 5.0 (0)", h2.toString());
}
@Test
public void testMultiDimensionalMerge() {
Limits l = new Limits();
double[] thresholds = {.5, 1.0, 5.0};
double[] value = {.5, .5};
l.addAxis("latency", thresholds);
thresholds = new double[] {500.0, 1000.0, 5000.0};
l.addAxis("size", thresholds);
Histogram h = new Histogram(l);
Histogram h2 = new Histogram(l);
h.put(value);
assertEquals("latency,size ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 0.5 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 1.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 5.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0))",
h2.toString());
h2.merge(h);
assertEquals("latency,size ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 0.5 ((1) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 1.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0)) < 5.0 ((0) < 500.0 (0) < 1000.0 (0) < 5000.0 (0))",
h.toString());
}
@Test
public void testEmptyHistogram() {
try {
new Histogram(new Limits());
} catch (IndexOutOfBoundsException e) {
return;
}
fail("Got no exception when trying to create an empty histogram.");
}
}
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