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Low Test Coverage
Your authentication module (src/lib/auth.ts) has 0% test coverage. This is a critical path — bugs here could silently break login and session handling in production.
Affected checks
You are a senior TypeScript engineer. Write a complete
Jest + ts-jest unit test suite for the file below.
Requirements:
- Cover every exported function with at least one
happy-path and one error/edge-case test
- Mock all external dependencies (firebase/auth,
fetch, etc.) using jest.mock()
- Use describe/it blocks with clear, readable names
- Assert on return values, thrown errors, and any
side-effects (e.g. firestore writes)
- Aim for ≥ 90% branch coverage
File to test — src/lib/auth.ts:
```ts
// Paste the contents of your auth.ts file here
```
Output only the test file. Do not include explanations.“GitDoctor completely transformed how I think about my codebase. I threw in a repo I had vibe-coded over a weekend and within minutes had a clear roadmap to turn it into a production-ready app — it now has real paying customers and I couldn't have done it without this tool.”
Indie Developer
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Full-Stack Engineer
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Solo Founder
Every scan runs 65 deterministic pattern-based checks plus deep AI analysis across 8 categories — not just surface-level linting. Know exactly where you stand before you onboard your first customer.
OWASP Top 10 Patterns
SQL injection, XSS, CSRF, broken auth, and dangerous eval() usage
Hardcoded Secrets
AWS keys, Stripe keys, OpenAI keys, JWT tokens, and private keys
Auth & Cookie Security
Unprotected routes, insecure cookies, CORS wildcards, missing rate limiting
Input Validation Gaps
API routes without Zod/Joi/Yup validation or file upload restrictions
Code Smells
God files, god modules, deep nesting, empty functions, commented-out code
Async Correctness
await in .map(), .then() without .catch(), mixed async patterns
Complexity Signals
Functions with 5+ params, 300+ line files, 15+ exports per module
Debug Artifacts
Excessive console.log, TODO/FIXME markers, debug mode flags
N+1 Query Detection
Database queries inside loops — the most common production killer
Event Loop Blockers
Synchronous file I/O, JSON.parse in loops, unbounded array growth
Parallelisation Gaps
Sequential awaits that could be Promise.all(), await inside .map()
Frontend Bundle Bloat
Full lodash/moment imports, missing code splitting, heavy re-renders
DevOps & Config
CI/CD pipeline, Dockerfile, health endpoint, .env.example, strict TypeScript
Testing Depth
Coverage ratio, empty test stubs, missing assertions, no e2e tests
Project Hygiene
Committed .env, .gitignore gaps, missing README, lock file presence
Dependency Health
Deprecated packages, duplicate libraries, loose version pinning
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