Test, Transform, Refactor

on YouTube ↗52m

" summary

Concrete claim: disciplined Red-Green-Refactor plus a prioritized set of micro-changes — transformation priority — reveals algorithms without big rabbit‑hole rewrites. Demonstration uses PHPSpec (Prophecy) and PHPUnit, a 20‑minute kata timebox, ping‑pong pairing and a walking‑skeleton approach. The Roman‑numerals kata gets built incrementally: null→constant→if→loop→generic and ends green and working. Advice: write tests for new work, refactor when tests make it hard, and prefer small, ordered transformations.

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" chapters (5)

1. 0:00Start
2. 11:01The Roman Numerals Kata
3. 24:02Walking skeleton
4. 25:41Transformation null - constant
5. 26:48Transformation statement - statements

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