test-driven Python development on O'Reilly.
"Test-driven development is not about testing. Test-driven development is about development (and design), specifically improving the quality and design of code. The resulting unit tests are just an extremely useful by-product.
That's all I'm going to tell you about test-driven development. The rest of this article will show you how it works. Come work on a project with me; we'll build a very simple tool together. I'll make mistakes, fix them, and change designs in response to what the tests tell me.
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