I don't use "proper" tdd, but I do write unit and acceptance tests on new code. My company has a lot of old, bad code (I just saw a FUNCTION that was 1000 lines long and used includes in php the other day...) which has no tests and is very hard to test due to the way they are written. Acceptance tests have been very helpful in making new features for web. Unfortunately our DBAs installed a new auth plugin for the database the other day and broke our test stack's ability to query the DB for acceptance tests. Something I have yet to figure out how to fix.
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