Formatting / Splitting string from Title Case to Delimited Words

Let the code speak :-)

Created a gist: https://gist.github.com/cullen-tsering/11084147

namespace tests

{

       [TestClass]

       public class string_extension_tests

       {

              [TestMethod]

              public void when_formatting_title_case_to_delimited_but_the_delimiter_is_not_specified()

              {

                     var s = "ThisIsTheDayThatTheLordHasMade";

                     var formated = s.TitleCaseToDelimited();

                     const string expected = "This Is The Day That The Lord Has Made";

                     Assert.AreEqual(expected, formated);

              }

              [TestMethod]

              public void when_formatting_title_case_to_delimited_and_the_delimiter_is_specified()

              {

                     var s = "ThisIsTheDayThatTheLordHasMade";

                     var formated = s.TitleCaseToDelimited("_");

                     const string expected = "This_Is_The_Day_That_The_Lord_Has_Made";

                     Assert.AreEqual(expected, formated);

              }

       }

       ///

       /// String helpers

       ///

       public static class StringExtensions

       {

              ///

              /// It converts a string with the format of "ThisIsTheDayThatTheLordHasMade" to "This Is The Day The Lord Has Made"

              /// insprired by the conversation here: http://stackoverflow.com/questions/155303/net-how-can-you-split-a-caps-delimited-string-into-an-array

              /// Limitation: this will split all upper cased letters into separate words.  I don't have a need to for consecutive upper
        /// case words to be as one word so go YAGNI.

              ///

              ///

              ///

              ///

              public static string TitleCaseToDelimited(this string str, params string[] delimiters)

              {

                     //if there is no data, let's waste our breath

                     if (string.IsNullOrWhiteSpace(str)) return str;

                     //if no delimiter specified, use space

                     string delimiter;

                     if (delimiters.Length == 0 || string.IsNullOrWhiteSpace(delimiters[0])) delimiter = " ";

                     else delimiter = delimiters[0];

                     //regex does the magic

                     return Regex.Replace(str, "(\\B[A-Z])", delimiter + "$1");

              }

       }

}