public void XorShiftDoesNotRepeadedlyReturnTheSameNumber()
{
var rng = new XorShiftRng();
const int iterations = 20;
double lastNumber = Double.NaN;
int count = 0;
// generate multiple random numbers
for (int i = 0; i < iterations; ++i)
{
var number = rng.GetDouble(min: -1.0, max: 1.0);
number.Should().BeGreaterOrEqualTo(-1.0, "because that is the lower bound");
number.Should().BeLessOrEqualTo(1.0, "because that is the upper bound");
// increase count if numbers are the same, otherwise reset counter
if (number.Equals(lastNumber))
{
++count;
}
else
{
count = 0;
}
// store number
lastNumber = number;
}
count.Should().BeLessOrEqualTo(5, "because more than five times the same number is highly unlikely");
}
public void GenerateInt64_Seed()
{
var rng = new XorShiftRng(1);
for (var i = 0; i < 100; i++)
{
Console.WriteLine(rng.GenerateInt64());
}
}
public void GenerateDoubleExceptZero()
{
var rng = new XorShiftRng();
for (var i = 0; i < 100; i++)
{
var x = rng.GenerateDoubleExceptZero();
Assert.IsTrue(0 < x && x < 1);
Console.WriteLine(x);
}
}
