public void Add_OneNumber()
        {
            var calc = new Calculator();

            Assert.AreEqual(5, calc.Add("5"));
        }
        public void Add_SpecifiedDelimiter()
        {
            var calc = new Calculator();

            Assert.AreEqual(6, calc.Add("//;\n1;2;3"));
        }
        public void Add_MultipleStringDelimeters()
        {
            var calc = new Calculator();

            Assert.AreEqual(6, calc.Add("//[%][***]\n1%2***3"));
        }
        public void Add_NewLineBetween()
        {
            var calc = new Calculator();

            Assert.AreEqual(6, calc.Add("1,2\n3"));
        }
        public void Add_IgnoreBiggerThanThousand()
        {
            var calc = new Calculator();

            Assert.AreEqual(2, calc.Add("2,1001"));
        }
        public void Add_FiveNumbers()
        {
            var calc = new Calculator();

            Assert.AreEqual(152, calc.Add("7,13,9,0,123"));
        }
        public void Add_EmptyString()
        {
            var calc = new Calculator();

            Assert.AreEqual(0, calc.Add(string.Empty));
        }
        public void Add_StringWithTwoNumbersWithCommaBetween()
        {
            var calc = new Calculator();

            Assert.AreEqual(16, calc.Add("11,5"));
        }
        public void Add_StringDelimeters()
        {
            var calc = new Calculator();

            Assert.AreEqual(6, calc.Add("//[***]\n1***2***3"));
        }