Unit test execution speed (how many tests per second?)

Question

What kind of execution rate do you aim for with your unit tests (# test per second)? How long is too long for an individual unit test?

I\'d be interested in knowing if

Answer 1

If we're talking strictly unit tests, I'd aim more for completeness than speed. If the run time starts to cause friction, separate the test into different project/classes etc., and only run the tests related to what you're working on. Let the Integration server run all the tests on checkin.