private void Test_10K_Tries(double[] probabilties, double[] resultsToCheck)
{
var generator = new AliasMethodGenerator(probabilties, CreateRealRandom());
const int attempts = 200000;
var results = new List <int>();
for (var i = 0; i < attempts; i++)
{
results.Add(generator.GetValue());
}
var grouped = results.GroupBy(i => i).ToDictionary(key => key.Key, value => (double)value.Count());
for (var i = 0; i < resultsToCheck.Length; i++)
{
if (grouped.ContainsKey(i))
{
var roundedProbability = System.Math.Round(grouped[i] / attempts, 2);
Assert.AreEqual(roundedProbability, resultsToCheck[i]);
}
else
{
Assert.AreEqual(0, resultsToCheck[i]);
}
}
}
public void Should_Generate_0_Value()
{
var random = CreateRandomMock(new List <Tuple <int, int> >()
{
Tuple.Create(2, 0), Tuple.Create(3, 0)
});
var generator = new AliasMethodGenerator(new double[] { 1, 2 }, random);
Assert.AreEqual(0, generator.GetValue());
}
public void Should_Return_Correct_Value_If_Only_Item()
{
var generator = new AliasMethodGenerator(new double[] { 1 }, CreateRealRandom());
Assert.AreEqual(0, generator.GetValue());
}
public void Should_Throw_Empty_Imput_Collection()
{
var generator = new AliasMethodGenerator(null, CreateRealRandom());
}
