Agent skill
reviewing-testability
Testable code design patterns for TypeScript/React applications. Use when reviewing code for testability, implementing dependency injection, or when user mentions テスト容易性, モック, mock-friendly, DI.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/reviewing-testability-thkt-claude-config
SKILL.md
Testability Review
Detection
| ID | Pattern | Fix |
|---|---|---|
| TE1 | Direct import { db } usage |
Inject dependency as parameter |
| TE1 | new Service() inside class |
Constructor injection |
| TE2 | fetch() inside component |
Extract to hook/service, inject |
| TE2 | Mixed side effects + logic | Separate pure/impure |
| TE3 | Deep mock chains | Simplify dependencies |
| TE4 | Global config access |
Pass config as prop/parameter |
| TE4 | Date.now() in logic |
Inject clock/time provider |
| TE5 | Tight coupling | Depend on abstractions (DIP) |
Criteria
Test setup < 10 lines. No deep mock chains. Dependencies explicit.
References
| Topic | File |
|---|---|
| DI | references/dependency-injection.md |
| Pure | references/pure-functions.md |
| Mocking | references/mock-friendly.md |
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