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

The goal is 100s of tests per second. The way you get there is by following Michael Feather's rules of unit tests.

An important point that came up in a past CITCON discussion is that if your tests aren't this fast it is quite likely that you aren't getting the design benefits of unit testing.