public int CountSubstring(string input, string value, int startIndex, int count, StringComparison comparisonType)
        {
            int result = CommonStringExtensions.CountSubstring(input, value, startIndex, count, comparisonType);

            PexAssert.IsTrue(result >= 0);

            return(result);
        }
        public int CountSubstring(string input, string value)
        {
            int result = CommonStringExtensions.CountSubstring(input, value);

            PexAssert.IsTrue(result >= 0);

            return(result);
        }