public void TestSquareRoot()
 {
     Assert.AreEqual(6.7, CodingQuiz_MathFunctions.SquareRoot(45), 2);  // the 1 after (100) signifies 1 number only 2 signifies 2 i.e 6.7
 }
        public void TestSumDouble()
        {
            double x = CodingQuiz_MathFunctions.Sum(10.5, 10.5);

            Assert.AreEqual(x, 21);
        }
        public void TestSumDecimal()
        {
            decimal x = CodingQuiz_MathFunctions.Sum(10.5M, 10.5M);

            Assert.AreEqual(x, 21);
        }
        public void TestSumInt()
        {
            int x = CodingQuiz_MathFunctions.Sum(2, 2);

            Assert.AreEqual(x, 4);
        }