A not so bad idea is to simply do a Google search for unit tests, and browse around there for a while. Also, check up on any stuff by Martin Fowler (especially Refactoring) and Kent Beck. Furthermore, http://www.junit.org/ is a veritable gold mine for unit testing, although most things there are exemplified in Java, it shouldn't be hard to follow. It probably would if it was the other way around though. :)

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You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.