Testing Patterns Skill

Purpose

Guide consistent and effective testing. Routes to existing test patterns and provides evidence templates.

When This Skill Applies

• Writing unit or integration tests
• Setting up test fixtures with RLS
• Running test suites
• Packaging test evidence

Critical Rules

FORBIDDEN

// Direct Prisma calls bypass RLS
const user = await prisma.user.findUnique({ where: { user_id } });

// Shared test state causes flaky tests
let sharedUser: User;
beforeAll(() => { sharedUser = createUser(); });

CORRECT

// Use RLS context helpers
const user = await withSystemContext(prisma, "test", async (client) => {
  return client.user.findUnique({ where: { user_id } });
});

// Isolated test state
beforeEach(() => {
  const testUser = createTestUser();
});

// Unique identifiers
const userId = `user-${crypto.randomUUID()}`;

Test Commands

{{TEST_UNIT_COMMAND}}        # Unit tests
{{TEST_INTEGRATION_COMMAND}} # Integration tests
{{TEST_E2E_COMMAND}}         # E2E tests (Playwright)
run your test suite      # Full validation

Test Directory Structure

__tests__/
├── unit/              # Fast, isolated tests
├── integration/       # API and database tests
├── e2e/               # End-to-end tests
└── setup.ts           # Global setup

Evidence Template

**Test Execution Evidence**

**Test Suite**: [unit/integration/e2e]
**Files Changed**: [list files]

**Test Results:**
- Total Tests: [X]
- Passed: [X]
- Failed: [0]

**Commands Run:**
```bash
{{TEST_UNIT_COMMAND}} --coverage

## Reference

- **Jest Config**: `jest.config.js`
- **RLS Context**: `lib/rls-context.ts`
- **Pattern Library**: `patterns_library/testing/`