public void ValidateCumulativeDistribution(double location, double scale, double x)
{
var n = new Laplace(location, scale);
double expected = 0.5 * (1.0 + (Math.Sign(x - location) * (1.0 - Math.Exp(-Math.Abs(x - location) / scale))));
Assert.AreEqual(expected, n.CumulativeDistribution(x));
Assert.AreEqual(expected, Laplace.CDF(location, scale, x));
}