Data Driven Test Removes Whitespace

[Gemil]

I am writing a unit test to test the following method.\[code\]public void MyMethod(string parm1){ // Validate parm1. string[] invalidTokens = new string[] { "/", "{", "}", ".", "--", ";", " ", ",", "=", "(", ")", "\"", "'", "?" }; foreach (string token in invalidTableTokens) { if (parm1.Contains(token)) throw new ArgumentException("Parameter cannot contain \"" + token + "\"."); } // No invalid characters so continue processing...}\[/code\]The unit test should verify that passing a string that contains an invalid character results in an exception. I want my unit test to be data driven with an XML (or CSV) datasource.\[code\][TestMethod()][DeploymentItem("\\path\my_data.xml")][DataSource("Microsoft.VisualStudio.TestTools.DataSource.XML", "|DataDirectory|\\my_data.xml", "Token", DataAccessMethod.Sequential)]public void MyMethod_Parm1ContainsInvalidCharacters_ThowsException(){ // Arrange string invalidToken = TestContext.DataRow["Token_Text"].ToString(); MyClass sut = new MyClass (); // Act string errorMessage = ""; try { sut.MyMethod(invalidToken); } catch (ArgumentException ex) { errorMessage = ex.Message; } // Assert Assert.AreEqual(errorMessage, "Parameter cannot contain \"" + invalidToken + "\".");}\[/code\]This works except when the tests needs to pass a single space character " ". Unfortunately, the value for \[code\]Token_Text\[/code\] is always "" when I need it to be a space.\[code\]<?xml version="1.0" encoding="utf-8" ?><InvalidTokens> <Token>/</Token> <Token>{</Token> <Token>}</Token> <Token>.</Token> <Token>--</Token> <Token>;</Token> <Token> </Token> <!-- Fails here--> <Token Token_Text=" "/> <!-- Also fail here --> <Token>,</Token> <Token>=</Token> <Token>(</Token> <Token>)</Token> <Token>"</Token> <Token>'</Token> <Token>?</Token></InvalidTokens>\[/code\]I have also tried this with the following CSV file and get the same results.\[code\]Token"/""{""}"".""--"";"" " <-- Fails here",""=""("")""""""'""?"\[/code\]How can I represent a single space character for use in a data driven unit test?