public void convert_number_1_to_I()
        {
            //Arrange -- Context              -- Given
            var convert        = new RomanNumeralConverter();
            var input          = "1";
            var expectedResult = "I";

            //Act     -- Do the thing         -- When
            var actualResult = convert.NumberConvertToRoman(input);

            //Assert  -- checking the result  -- Then
            Assert.Equal(expectedResult, actualResult);
        }