ad-hockery: /ad·hok'@r·ee/, n.
Gratuitous assumptions... which lead to the appearance of semi-intelligent behavior but are in fact entirely arbitrary. Jargon File

Articles tagged ‘outside-in’

How can test it if I don't know what I'm building yet?

One objection to the practice of TDD I’ve heard from several different people is along the lines of “I don’t know exactly what I’m building at the outset, the code is experimental, so how can I write tests for it?”

Frequently it is the case that you have an idea but don’t know the mechanics of how you’re going to implement it. I find this particularly when I’m writing code that extends a third-party library. You don’t know exactly where the API hooks you’ll need to use are, your understanding of the API is fuzzy and you expect to learn it as you go. So how do you test-drive in that situation?

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