测试函数的测试用例

　　　一天，主管要俺测试函数，倒是被吓了一跳。鄙人孤陋寡闻，没见过这方面的测试和用例。于是发明了一套，拿出来给各位长老点评。以下是设计的用例：

 由于测试的是网站(asp.net)，于是创建了一个网站工程。以下是驱动部分的代码（其实俺并不知驱动是啥）：

protected void Page_Load(object sender, EventArgs e)
    {
        string str1 = test.InterceptString("American",3);
        Response.Write(str1);
        Response.Write("<br/>");

        string str2 = test.InterceptString("", 3);
        Response.Write(str2);
        Response.Write("<br/>");

        string str3 = test.InterceptString("12345", 3);
        Response.Write(str3);
        Response.Write("<br/>");

        string str4 = test.InterceptString("本人在北京一所民办高校（哪个学校不说了）里面做程序开发，主要做的是招生系统。因为就我一个程序员，也算是技术总监了！", 6);
        Response.Write(str4);
        Response.Write("<br/>");

        string str5 = test.InterceptString("cccccc", 3);
        Response.Write(str5);
        Response.Write("<br/>");

        string str6 = test.InterceptString("＜注释＞", 3);
        Response.Write(str6);
        Response.Write("<br/>");

        string str7 = test.InterceptString("<注释>", 3);
        Response.Write(str7);
        Response.Write("<br/>");
    }

在App_code下兴建了一个类，是被调用的函数：

    public static string InterceptString(string stringToSub, int length)
        {
            Regex regex = new Regex("[\u4e00-\u9fa5]+", RegexOptions.Compiled);
            char[] stringChar = stringToSub.ToCharArray();
            StringBuilder sb = new StringBuilder();
            int nLength = 0;
            for (int i = 0; i < stringChar.Length; i++)
            {
                if (regex.IsMatch((stringChar[i]).ToString()))
                {
                    nLength += 2;
                }
                else
                {
                    nLength = nLength + 1;
                }

                if (nLength <= length)
                {
                    sb.Append(stringChar[i]);
                }
                else
                {
                    break;
                }
            }
            if (sb.ToString() != stringToSub)
            {
                sb.Append("...");
            }

            return sb.ToString();
        }