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 @5d859d2e testing it by running it and clicking around or whatever, then eventually encoding those behaviors as tests once they stabilize 
 @8bb49bc2 okay, so you end up with developer tests, or do you mean regression tests? 
 @5d859d2e yeah the tests are written by the developers, usually near the end or at least after the midpoint of the project. A number of them are regression tests of a sort, if particularly tricky bugs were encountered during development.