public void Dividing_two_positive_integers_parametrized(double x, double y, double expected_result)
        {
            // arrange
            var calc = new ExampleCalculator();

            // act
            var result = calc.Divide(x, y);

            // assert
            Assert.Equal(expected_result, result);
        }
        public void Dividing_two_positive_integers()
        {
            // arrange
            var x    = 20;
            var y    = 2;
            var calc = new ExampleCalculator();

            // act
            var result = calc.Divide(x, y);

            // assert
            Assert.Equal(10, result);
        }