public void CalculateTests(double firstValue, double expected)
        {
            SQRTCalculator sqrtCalculator = new SQRTCalculator();
            double         result         = sqrtCalculator.Calculate(firstValue);

            Assert.AreEqual(expected, result, 0.001);
        }
        public void NegativeCalculateTests()
        {
            SQRTCalculator sqrtCalculator = new SQRTCalculator();

            Assert.Throws <Exception>(() => sqrtCalculator.Calculate(-1));
        }