What's a microtest, anyway? I write a ton of tests as I'm building code, and the majority of these are a particular kind or style of test, the microtest kind. Let's talk about what I mean by that, today, then we'll talk later about how that turns out to help me so much. A microtest is a small, fast, precise, easy-to-invoke/read/write/debug chunk of code that exercises a single particular path through another chunk of code containing the branching logic from my shipping app. Microtests are first-class source code, maintained and kept side-by-side in the vault with the source code that makes up the shipping app. They are maintained with the same level of attention, the same standard of excellence, as the production source is.


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