LTAF is an integration test framework developed by the Microsoft ASP.NET QA Team. Integration tests are different than unit tests, they actually test what a user would be doing by opening up the browser and filling in textboxes or clicking links. LTAF is nice because you write your tests in C# and run them in the browser of your choice, the disadvantage to this is you can’t have it easily integrate with a continuous integration system like CruiseControl.NET since there is no runner.