Ask HN: Test driven web development

I'm gradually becoming more interested in test driven development, and I decided to use it on one of my projects.

I am also thinking about using this approach on another project - a web application which I'm writing in django. I'm having some trouble wrapping my head around writing unit tests for something which will ultimately be quite highly coupled with a framework.

Can anyone here recommend of a good way for going about this? How have you done it? Does it simply not work?

P.S. General good information about TDD would also be appreciated, since I'm new to the whole concept.