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Add unit tests for com.tagtraum.perf.gcviewer.math.DoubleData #222

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Add unit tests for com.tagtraum.perf.gcviewer.math.DoubleData #222

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16 changes: 15 additions & 1 deletion src/test/java/com/tagtraum/perf/gcviewer/math/TestDoubleData.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
* Date: Jan 30, 2002
* Time: 5:53:55 PM
* @author <a href="mailto:[email protected]">Hendrik Schreiber</a>
*
*/
public class TestDoubleData {

Expand All @@ -18,14 +19,27 @@ public void testSimpleAverage() throws Exception {
assertEquals("Simple average", 1.5, DoubleData.average(x), 0.0);
}

@Test
public void testSimpleStandardDeviation() throws Exception {
DoubleData doubleData = new DoubleData();
doubleData.add(1);
doubleData.add(1);
doubleData.add(-1);
doubleData.add(-1);

assertEquals("Simple std deviation", 1.1547005383792515, doubleData.standardDeviation(), 0.0000001);
}

@Test
public void testWeightedAverage() {
double[] n = {4.0, 5.0, 6.0};
int[] weight = {2, 3, 4};
assertEquals(5.222, DoubleData.weightedAverage(n, weight), 0.001);
}

@Test
public void testWeightedAverageNaN() {
double[] n = {Double.NaN};
int[] weight = {6, -1, 0, 0};
assertEquals(Double.NaN, DoubleData.weightedAverage(n, weight), 0.0);
}
}