public void ToStr_NumberValue_ReturnStringFormatOfNumber(int num, string expected)
        {
            var actual = StringToIntegerViceVersa.ToStr(num);

            Assert.Equal(expected, actual);
        }
        public void ToInt_StringInNumberFormat_ReturnIntFormatOfString(string str, int expected)
        {
            var actual = StringToIntegerViceVersa.ToInt(str);

            Assert.Equal(expected, actual);
        }