public static void CurvatureImplicit(
            double Fx, double Fy,
            double Fxx, double Fxy, double Fyy,
            double expected)
        {
            double result = GeometryLibrary.CurvatureImplicit(Fx, Fy, Fxx, Fxy, Fyy);

            Assert.AreEqual(expected, result, Tolerance);
        }
 public static void CurvatureImplicit_Throws_DivideByZeroException(
     double Fx, double Fy,
     double Fxx, double Fxy, double Fyy)
 {
     Assert.Throws <DivideByZeroException>(() => GeometryLibrary.CurvatureImplicit(Fx, Fy, Fxx, Fxy, Fyy));
 }