/** Tests recording of count histograms. */
@SmallTest
public void testRecordCountHistogram() {
String histogram = "HelloWorld.CountMetric";
HistogramDelta zeroCount = new HistogramDelta(histogram, 0);
HistogramDelta oneCount = new HistogramDelta(histogram, 1);
HistogramDelta twoCount = new HistogramDelta(histogram, 2);
HistogramDelta eightThousandCount = new HistogramDelta(histogram, 8000);
assertEquals(0, zeroCount.getDelta());
assertEquals(0, oneCount.getDelta());
assertEquals(0, twoCount.getDelta());
assertEquals(0, eightThousandCount.getDelta());
RecordHistogram.recordCountHistogram(histogram, 0);
assertEquals(1, zeroCount.getDelta());
assertEquals(0, oneCount.getDelta());
assertEquals(0, twoCount.getDelta());
assertEquals(0, eightThousandCount.getDelta());
RecordHistogram.recordCountHistogram(histogram, 0);
assertEquals(2, zeroCount.getDelta());
assertEquals(0, oneCount.getDelta());
assertEquals(0, twoCount.getDelta());
assertEquals(0, eightThousandCount.getDelta());
RecordHistogram.recordCountHistogram(histogram, 2);
assertEquals(2, zeroCount.getDelta());
assertEquals(0, oneCount.getDelta());
assertEquals(1, twoCount.getDelta());
assertEquals(0, eightThousandCount.getDelta());
RecordHistogram.recordCountHistogram(histogram, 8000);
assertEquals(2, zeroCount.getDelta());
assertEquals(0, oneCount.getDelta());
assertEquals(1, twoCount.getDelta());
assertEquals(1, eightThousandCount.getDelta());
}
