public void ValidateGetMomentsFailsWithBadParameters(double a, double c, double k, double order)
{
var n = new Burr(a, c, k);
Assert.That(() => n.GetMoment(order), Throws.ArgumentException);
}
public void ValidateMoments(double a, double c, double k, int order, double value)
{
var n = new Burr(a, c, k);
AssertHelpers.AlmostEqualRelative(value, n.GetMoment(order), lowPrecision);
}