public void OneDividedByTest(double firstValue, double expected)
        {
            var calculator   = new OneDividedByCalculator();
            var actualResult = calculator.Calculate(firstValue);

            Assert.AreEqual(expected, actualResult, 0.01);
        }
        public void ExceptionTest()
        {
            var calculator = new OneDividedByCalculator();

            Assert.Throws <Exception>(() => calculator.Calculate(0));
        }