Ask HN: What do you use to keep track of test cases for unit testing web apps?

I'm working as a solo developer on a website. I need a place to store my steps to repeat my unit tests that involve manual interaction w/ the browser + tools. Right now I'm using Evernote to store/track these. I'm just wondering how others do this sort of thing. Here's a slimmed-down example of a test case that I need to write down + perform: ======= Test: Response header is correct for custom 404 1) Enable debugging in Visual Studio 2) Set a breakpoint at Application_Error() 3) Enable the Firefox user agent switcher - switch to a new agent 4) Launch Fiddler 5) Browse to http://myurl/ 6) If logged in, log out 7) Browse to http://myurl/filethatdoesnotexist.aspx Expected result: 404 custom error page + logging in IIS of the 404 + breakpoint hit + headers report 404 ======= * This isn't a legit test case - but it's the kind of thing that Selenium can't really do (that I know of). And sometimes I also want to do other things at various points during the test - things that require manually stopping/pausing the test (maybe I want to repeat steps 3-6 n times, once for several other user agents for example). How do you handle this sort of thing?