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Baron Schwartz, author of High Performance MySQL, got some interesting comments on his previous article about unit testing Maatkit, including echoes of my own conversion to the unit-testing religion. One of the objections he had heard a lot about unit-testing is how it’s impossible to test code that talks to a database. “It’s too hard,” they say. “Oh, it’s easy to test a module that calculates a square root, but a database? Way too much work!”