@Test
public void testWindowSize() {
DescriptiveStatistics stats = createDescriptiveStatistics();
stats.setWindowSize(300);
for (int i = 0; i < 100; ++i) {
stats.addValue(i + 1);
}
int refSum = (100 * 101) / 2;
Assert.assertEquals(refSum / 100.0, stats.getMean(), 1E-10);
Assert.assertEquals(300, stats.getWindowSize());
try {
stats.setWindowSize(-3);
Assert.fail("an exception should have been thrown");
} catch (MathIllegalArgumentException iae) {
// expected
}
Assert.assertEquals(300, stats.getWindowSize());
stats.setWindowSize(50);
Assert.assertEquals(50, stats.getWindowSize());
int refSum2 = refSum - (50 * 51) / 2;
Assert.assertEquals(refSum2 / 50.0, stats.getMean(), 1E-10);
}
