# Test Repository

> Guide for testing repository layer. Use when asked to test repositories or data access layer. Directs to implementation-specific testing skills.

- Skill: `majiayu000/test-repository` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/test-repository`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/test-repository/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/test-repository

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# Test Repository

## Important: We Test Implementations, Not Interfaces

Repository interfaces (`I{Entity}Repository`) define contracts but contain no logic to test. We test the **implementations** that fulfill these contracts.

## When to Test

Test repository implementations **after** you have:

1. Created the repository interface (`create-repository` skill)
2. Implemented at least one concrete implementation

## Which Skill to Use

| Implementation     | Skill                     | Location                                                 |
| ------------------ | ------------------------- | -------------------------------------------------------- |
| MockDB (in-memory) | `test-mockdb-repository`  | `tests/repositories/{entity}.mockdb.repository.test.ts`  |
| MongoDB            | `test-mongodb-repository` | `tests/repositories/{entity}.mongodb.repository.test.ts` |

## Testing Strategy

Each implementation should be tested to verify it correctly fulfills the interface contract:

- **CRUD operations**: create, findById, findAll, update, remove
- **Query features**: filtering, pagination, sorting, search
- **Edge cases**: not found returns null, delete non-existent returns false
- **Implementation-specific**: MongoDB indexes, MockDB in-memory behavior

## See Also

- `test-mockdb-repository` - Testing MockDB implementations
- `test-mongodb-repository` - Testing MongoDB implementations (includes test infrastructure setup)