public static void CurvaturePolar_Throws_DivideByZeroException(double radius, double radiusPrime, double radiusPrimeDouble)
 {
     Assert.Throws <DivideByZeroException>(() => GeometryLibrary.CurvaturePolar(radius, radiusPrime, radiusPrimeDouble));
 }
        public static void CurvaturePolar(double radius, double radiusPrime, double radiusPrimeDouble, double expected)
        {
            double result = GeometryLibrary.CurvaturePolar(radius, radiusPrime, radiusPrimeDouble);

            Assert.AreEqual(expected, result, Tolerance);
        }