private static void ExpectMissRate(ArtificialCacheMissOptions options, int samples)
{
var rng = new Random(909090);
int misses = 0;
for (int i = 0; i < samples; i++)
{
ulong high = unchecked (((ulong)rng.Next()) << 32);
ulong low = unchecked ((ulong)rng.Next());
long val = unchecked ((long)(high | low));
if (options.ShouldHaveArtificialMiss(val))
{
misses++;
}
}
double actualRate = (double)misses / samples;
double deltaOfPercentages = Math.Abs(actualRate - options.EffectiveMissRate);
double error = deltaOfPercentages / options.EffectiveMissRate;
if (double.IsInfinity(error) || error > 0.1)
{
XAssert.Fail(
"Options {0} gave {1} misses; expected {2} ; error {3:P}",
options.ToString(),
misses,
options.EffectiveMissRate * samples,
error);
}
}
private static void ExpectParseFailure(string value)
{
ArtificialCacheMissOptions options = ArtificialCacheMissOptions.TryParse(value, CultureInfo.InvariantCulture);
if (options != null)
{
XAssert.Fail("Expected parse failure for {0}; got options {1}", value, options.ToString());
}
}
private static void ExpectParseSuccess(string value, double rate, bool inverted, int?seed = null)
{
ArtificialCacheMissOptions options = ArtificialCacheMissOptions.TryParse(value, CultureInfo.InvariantCulture);
XAssert.IsNotNull(options, "Expected parse success for {0}", value);
XAssert.AreEqual(rate, options.Rate, "Incorrect rate");
XAssert.AreEqual(inverted, options.IsInverted, "Incorrect inversion");
if (seed.HasValue)
{
XAssert.AreEqual(seed.Value, options.Seed, "Incorrect seed");
}
}
