MiniTest is the no-nonsense testing framework you already know how to use. If we strive for cleaner and simpler code in our own work, wouldn't it be nice to have that in our test framework too? Whether you're a Test Unit fan or RSpec fan, you'll feel right at home using MiniTest. Its simplicity makes it fast, easy to use, extendable, and maybe most importantly, easy to understand. Plus, Rails 4 uses MiniTest.
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Rails Conf 2012