スキルは一度書くだけ。
組み合わせ、保ち、どこでも使う。

---
name: typescript-testing
description: Testing conventions for TypeScript
---
# TypeScript testing

Use vitest for all unit tests. Co-locate
test files next to the module under test.

- One `describe` block per exported function.
- Mock at the module boundary, never the
  network layer.