Add backend test coverage suite and CI pipeline

[Manmeetkaur06]

Summary

This PR adds a backend test coverage suite and a GitHub Actions CI pipeline for the Guardian backend project.

The test suite covers the main implemented backend flows, including authentication, RBAC, admin dashboard, admin task management, admin patient reassignment, patient workflows, organisation and staff approval, notifications, AI signal/alert flows, health records, prescriptions, patient logs, care team dashboards, doctor workflows, and shared service/helper logic.

The CI pipeline automatically runs backend tests and validates the Docker build on pull requests.

Changes Made

• Added structured Mocha/Chai backend tests under src/test/
• Added shared test helpers for:
  • test app setup
  • database setup and cleanup
  • reusable fixtures
  • mock response utilities
• Added NYC coverage configuration with .nycrc and .nycrc.json
• Added package scripts for:
  • running tests
• Added GitHub Actions workflow: Backend CI
• CI now runs:
  • dependency installation using npm ci
  • automated backend tests
  • Docker image build validation

Coverage Result

Current local result:

• 65 passing tests
• 0 failing tests
• Line coverage: approximately 79.24%
• Function coverage: approximately 81.67%
• Statement coverage: approximately 77.66%
• Branch coverage: approximately 66.32%

This provides approximately 80% backend test coverage, which supports the project testing and CI/CD goal.

Test Evidence

Tested locally with:

docker compose down -v
docker compose up -d mongo
npm run test:coverage

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Project	Deployment	Actions	Updated (UTC)
guardian-backend-	Ready	Preview, Comment	May 27, 2026 10:56pm

[SHUBHAM-2305]

Good foundation for backend testing and CI. Since there were no proper automated tests before, this PR is an important first step toward improving reliability and regression testing. The current setup can be extended further with more unit, integration, and workflow-based tests as the backend grows.

Good work.