如何在ASP中实现TDD。净WebForms

I know that the reason that Microsoft came out with ASP.NET MVC was to make it simpler to do Test Driven Design (TDD) for ASP.NET. However, I have a rather large brown field (existing) application in ASP.NET WebForms that I would love to implement some TDD type functionality in. I'm assuming that there IS a way to do this, but what are some viable options?I know that the reason that Microsoft came out