public void HistogramCanReadWhatItWrote()
{
var histogram = new InternalHistogram();
for (long i = 0; i < 10; i++)
{
histogram.AddValue(i / 2);
}
var histogram2 = new InternalHistogram();
using (var mem = new MemoryStream())
{
histogram.WriteToPersistedData(mem);
mem.Position = 0;
using (var buffer = new BufferedValueArray.VariableLengthBufferedValueArray(mem.GetBuffer(), 0, (int)mem.Length))
{
histogram2.MergeFrom(new MultiValueMergeSource(buffer, 0));
}
}
Assert.AreEqual(histogram.SampleCount, histogram2.SampleCount);
foreach (var kvp in histogram.Data)
{
Assert.AreEqual(kvp.Value, histogram2.Data[kvp.Key]);
}
}
public void HistogramSupportsLargeNumbersOfValues()
{
var histogram = new InternalHistogram();
ulong expectedSampleCount = 0;
for (var i = short.MinValue; i < short.MaxValue; ++i)
{
histogram.AddValue(i);
histogram.AddValue(i);
histogram.AddValue(i);
expectedSampleCount += 3;
}
Assert.AreEqual(expectedSampleCount, histogram.SampleCount);
var outputData = new Dictionary<long, uint>();
histogram.UpdateDictionary(outputData);
for (var i = short.MinValue; i < short.MaxValue; ++i)
{
Assert.AreEqual((uint)3, outputData[i]);
}
}
public void HistogramMaintainsCountOfAddedSamples()
{
const ulong anySampleCount = 42;
var histogram = new InternalHistogram();
for (ulong i = 0; i < anySampleCount; ++i)
{
histogram.AddValue((long)i);
}
Assert.AreEqual(anySampleCount, histogram.SampleCount);
}
public void HistogramUpdateDictionaryDoesNotOverwriteContents()
{
var initialData = new Dictionary<long, uint>();
const long initialDataKey = 867;
const uint initialDataValue = 5309;
initialData.Add(initialDataKey, initialDataValue);
const int histogramValue = 33;
var histogram = new InternalHistogram();
histogram.AddValue(histogramValue);
histogram.AddValue(histogramValue);
histogram.UpdateDictionary(initialData);
Assert.AreEqual(2, initialData.Count);
Assert.AreEqual(initialDataValue, initialData[initialDataKey]);
Assert.AreEqual((uint)2, initialData[histogramValue]);
}
public void HistogramCountsOccurencesOfAddedValues()
{
const int oneTimeValue = 7;
const int multiTimeValue = 42;
const uint multiTimeValueCount = 13;
var histogram = new InternalHistogram();
histogram.AddValue(oneTimeValue);
for (var i = 0; i < multiTimeValueCount; ++i)
{
histogram.AddValue(multiTimeValue);
}
var values = new Dictionary<long, uint>();
histogram.UpdateDictionary(values);
Assert.AreEqual((uint)1, values[oneTimeValue]);
Assert.AreEqual(multiTimeValueCount, values[multiTimeValue]);
Assert.AreEqual(2, values.Count);
}
public void HistogramInitialContentsAreEmpty()
{
var histogram = new InternalHistogram();
Assert.AreEqual((ulong)0, histogram.SampleCount);
var d = new Dictionary<long, uint>();
histogram.UpdateDictionary(d);
Assert.AreEqual(0, d.Count);
}