---
tags:
  - tdd
  - software-design
  - software-engineering
---
Detroit-style TDD focuses mainly on working bottom up, starting with the core of the domain working outward.
London-style TDD works outside in, starting at an API endpoint or controller working inwards.

The primary con of london style is to build things that aren't needed ([[YAGNI]])

https://github.com/testdouble/contributing-tests/wiki/London-school-TDD