public void TestWithLongestSubstringAtTheEnd()
        {
            FindLongestSubstringCount c = new FindLongestSubstringCount();
            string s   = "ababcabcd";
            int    len = c.HandleFindLongestSubstringCount(s);

            Assert.AreEqual(4, len);
        }
        public void TestWithLongestSubstringInMiddle()
        {
            FindLongestSubstringCount c = new FindLongestSubstringCount();
            string s   = "ababcdeabcd";
            int    len = c.HandleFindLongestSubstringCount(s);

            Assert.AreEqual(5, len);
        }
        public void TestWithJustOneCharacter()
        {
            FindLongestSubstringCount c = new FindLongestSubstringCount();
            string s   = "a";
            int    len = c.HandleFindLongestSubstringCount(s);

            Assert.AreEqual(1, len);
        }