public void ProbabilityDistribution_OneD3_ReturnExpectedDistribution()
{
// Setup
var rng = MockRepository.GenerateStub <IRandomNumberGenerator>();
var dice = new[]
{
new NumericalDie(3, rng),
};
var sumOf2D6 = new SumOfDice(dice, rng);
// Call
DiscreteValueProbabilityDistribution distribution = sumOf2D6.ProbabilityDistribution;
// Assert
var expectedProbabilityValuePairs = new[]
{
Tuple.Create(1, 1.0 / 3.0),
Tuple.Create(2, 1.0 / 3.0),
Tuple.Create(3, 1.0 / 3.0),
};
Assert.AreEqual(expectedProbabilityValuePairs.Length, distribution.Specification.Count);
for (int i = 0; i < expectedProbabilityValuePairs.Length; i++)
{
Tuple <int, double> expectedPair = expectedProbabilityValuePairs[i];
ValueProbabilityPair actualPair = distribution.Specification[i];
Assert.AreEqual(expectedPair.Item1, actualPair.Value);
Assert.AreEqual(expectedPair.Item2, actualPair.Probability, 1e-6);
}
}
private static void AssertExpectedDistribution(int numberOfDice, int numberOfSides, DiscreteValueProbabilityDistribution actualDistribution)
{
var rng = MockRepository.GenerateStub <IRandomNumberGenerator>();
IEnumerable <NumericalDie> dice = Enumerable.Repeat(numberOfSides, numberOfDice)
.Select(nrOfSides => new NumericalDie(nrOfSides, rng));
var sumOfDice = new SumOfDice(dice, rng);
DiscreteValueProbabilityDistribution expectedDistribution = sumOfDice.ProbabilityDistribution;
AssertEquals(expectedDistribution, actualDistribution);
}
public void Constructor_ExpectedValues()
{
// Setup
var rng = MockRepository.GenerateStub <IRandomNumberGenerator>();
var die = MockRepository.GenerateStub <IAbstractDie>();
die.Stub(d => d.ProbabilityDistribution).Return(new DiscreteValueProbabilityDistribution(new[] { new ValueProbabilityPair(0, 1.0) }));
var dice = new[]
{
die,
};
// Call
var sumOfDice = new SumOfDice(dice, rng);
// Setup
Assert.IsInstanceOf <IAbstractDie>(sumOfDice);
}
public void Roll_ReturnRamdomlyGeneratedValueAccordingToProbabilityDistribution()
{
// Setup
var rngExpectedValueAndProbability = new[]
{
Tuple.Create(2, 0.0),
Tuple.Create(2, 0.68 / 36.0),
Tuple.Create(2, 1.0 / 36.0),
Tuple.Create(3, (1.0 + 1e-6) / 36.0),
Tuple.Create(3, 1.234 / 36.0),
Tuple.Create(3, 3.0 / 36.0),
Tuple.Create(4, (3.0 + 1e-6) / 36.0),
Tuple.Create(4, 4.768 / 36.0),
Tuple.Create(4, 6.0 / 36.0),
Tuple.Create(5, (6.0 + 1e-6) / 36.0),
Tuple.Create(5, 8.96 / 36.0),
Tuple.Create(5, 10.0 / 36.0),
Tuple.Create(6, (10.0 + 1e-6) / 36.0),
Tuple.Create(6, 12.5678 / 36.0),
Tuple.Create(6, 15.0 / 36.0),
Tuple.Create(7, (15.0 + 1e-6) / 36.0),
Tuple.Create(7, 19.856 / 36.0),
Tuple.Create(7, 21.0 / 36.0),
Tuple.Create(8, (21.0 + 1e-6) / 36.0),
Tuple.Create(8, 23.68 / 36.0),
Tuple.Create(8, 26.0 / 36.0),
Tuple.Create(9, (26.0 + 1e-6) / 36.0),
Tuple.Create(9, 29.56 / 36.0),
Tuple.Create(9, 30.0 / 36.0),
Tuple.Create(10, (30.0 + 1e-6) / 36.0),
Tuple.Create(10, 31.34 / 36.0),
Tuple.Create(10, 33.0 / 36.0),
Tuple.Create(11, (33.0 + 1e-6) / 36.0),
Tuple.Create(11, 34.76 / 36.0),
Tuple.Create(11, 35.0 / 36.0),
Tuple.Create(12, (35.0 + 1e-6) / 36.0),
Tuple.Create(12, 35.956 / 36.0),
Tuple.Create(12, 1.0),
};
var rng = new TestingRandomNumberGenerator();
rng.AddFactorValues(rngExpectedValueAndProbability.Select(t => t.Item2));
var rngStub = MockRepository.GenerateStub <IRandomNumberGenerator>();
var dice = new[]
{
new NumericalDie(6, rngStub),
new NumericalDie(6, rngStub),
};
var sumOf2D6 = new SumOfDice(dice, rng);
foreach (Tuple <int, double> pair in rngExpectedValueAndProbability)
{
// Call
int dieResult = sumOf2D6.Roll();
// Assert
Assert.AreEqual(pair.Item1, dieResult, $"Asserting for probability value {pair.Item2}.");
}
}
private void UpdateForNewSumOfDiceParameters()
{
diceSum = new SumOfDice(GenerateDice(numberOfDice, numberOfSides), rng);
}
