public void ReplaceTest()
 {
     string formatString = "Hello,[Person], you are a good [[job]]";
     IDictionary<string, string> replacePattern = new Dictionary<string, string>
                                                      {
                                                          {"Person", "John"},
                                                          {"job", "student"}
                                                      };
     string expected = "Hello,John, you are a good [student]";
     string actual;
     var target = new NamedFormatterHelper();
     actual = target.Replace(formatString, replacePattern);
     Assert.AreEqual(expected, actual);
 }