public void Roll_BasedOnProbabilityDistribution_ReturnExpectedResult(ComparisonType comparisonType)
{
// Setup
var spec = new[]
{
new ValueProbabilityPair(1, 0.25),
new ValueProbabilityPair(4, 0.5),
new ValueProbabilityPair(8, 0.25),
};
var die = MockRepository.GenerateStub <IAbstractDie>();
die.Stub(d => d.ProbabilityDistribution).Return(new DiscreteValueProbabilityDistribution(spec));
var rng = new TestingRandomNumberGenerator();
const int referenceValue = 4;
var thresholdCompare = new ThresholdCompare(die, comparisonType, referenceValue, rng);
double successProbability = thresholdCompare.ProbabilityDistribution.SuccessProbability;
var expectedValueAndProbabilities = new[]
{
Tuple.Create(true, 0.0),
Tuple.Create(true, successProbability - 0.1),
Tuple.Create(true, successProbability),
Tuple.Create(false, successProbability + 1e-6),
Tuple.Create(false, successProbability + 0.1),
Tuple.Create(false, 1.0),
};
rng.AddFactorValues(expectedValueAndProbabilities.Select(t => t.Item2));
foreach (Tuple <bool, double> expectedValueAndProbability in expectedValueAndProbabilities)
{
// Call
bool rolledResult = thresholdCompare.Roll();
// Assert
Assert.AreEqual(rolledResult, expectedValueAndProbability.Item1);
}
}
