private Test CreateCollisionProbabilityTest()
{
return(new TestCase("CollisionProbabilityTest", () => AssertionHelper.Verify(() =>
{
HashStoreResult result;
try
{
result = GetResult();
}
catch (NotEnoughHashesException exception)
{
return new AssertionFailureBuilder("Not enough hash code samples were provided to the hash code acceptance contract.")
.AddException(exception)
.SetStackTrace(Context.GetStackTraceData())
.ToAssertionFailure();
}
var probability = result.CollisionProbability;
TestLog.WriteLine("Statistical Population = {0}", result.StatisticalPopulation);
TestLog.WriteLine("Actual Collision Probability = {0} {1} {2}", probability, ((probability <= collisionProbabilityLimit) ? "≤" : ">"), collisionProbabilityLimit);
if (probability <= collisionProbabilityLimit)
{
return null;
}
return new AssertionFailureBuilder(String.Format("The actual collision probability {0} is higher than the specified limit of {1}.", probability, collisionProbabilityLimit))
.AddRawExpectedValue(collisionProbabilityLimit)
.AddRawActualValue(probability)
.SetStackTrace(Context.GetStackTraceData())
.ToAssertionFailure();
})));
}
public void Constructs_ok()
{
var result = new HashStoreResult(123, 456d, 789d);
Assert.AreEqual(123, result.StatisticalPopulation);
Assert.AreEqual(456d, result.CollisionProbability);
Assert.AreEqual(789d, result.UniformDistributionDeviationProbability);
}
private HashStoreResult GetResult()
{
if (result == null)
{
var store = new HashStore(GenericCollectionUtils.Select(DistinctInstances, o => o.GetHashCode()));
result = store.Result;
}
return(result);
}
