Add test coverage analysis document

[kuduzow]

Analyzed the codebase and documented zero test coverage state.
Identified priority areas for testing and discovered 3 bugs.
Provided recommendations for Jest setup and test structure.

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Note

Adds TEST_COVERAGE_ANALYSIS.md outlining zero coverage, prioritized tests, three discovered bugs, and Jest setup/config with suggested test structure.

• Docs: Add TEST_COVERAGE_ANALYSIS.md
  • Current State: No tests/framework; placeholder npm test script.
  • Prioritized Test Plan:
    • Unit: utils/time.js (haveManySecondsHavePassed).
    • Integration: routes/messages.route.js (GET/POST/DELETE incl. validation and rate limit), routes/contacts.route.js, routes/profile.route.js.
    • Models: Validation for Message, Contact, Profile.
    • Error Handling: API failure/malformed input/invalid params.
  • Bugs Identified:
    • messages.route.js:55: NPE risk when no messages for rate limiting.
    • profile.route.js:9: Incorrect spread of find result.
    • messages.route.js:70: message.save() not awaited.
  • Setup Recommendations:
    • Install jest, supertest, mongodb-memory-server and add test scripts.
    • Provide jest.config.js and proposed __tests__/ structure.

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