feat: Add MongoDB integration tests with CI support

[dcoric]

Summary

Adds comprehensive MongoDB integration tests for the database layer (repos, users, pushes) with CI integration. Tests run against a real MongoDB instance to validate database operations beyond unit test coverage.
Fixes #1168

What's New

• Adds integration test coverage for MongoDB operations
• Test infrastructure with automatic setup/teardown and database cleanup
• CI integration running tests across MongoDB 6.0, 7.0, and 8.0
• Enhanced database helper with connection management utilities
• Documentation for running integration tests locally with Docker

Running Locally

Integration tests require MongoDB running on localhost:27017. The connection string is configured in vitest.config.integration.ts.

# Start MongoDB with Docker
docker run -d --name mongodb-test -p 27017:27017 mongo:7

# Run integration tests
npm run test:integration

# Cleanup
docker stop mongodb-test && docker rm mongodb-test

The RUN_MONGO_TESTS environment variable is automatically set by the vitest config, but can be overridden if needed.

Running in CI

Integration tests run automatically in the CI pipeline after unit tests. MongoDB is already started via supercharge/mongodb-github-action in the build matrix (versions 6.0, 7.0, 8.0), so the tests execute against the existing MongoDB instance.

The CI step simply runs:

- name: MongoDB Integration Tests
  env:
    RUN_MONGO_TESTS: 'true'
  run: npm run test:integration

Configuration

Connection string is set in vitest.config.integration.ts:

• Local/CI: mongodb://localhost:27017/git-proxy-test
• Database: git-proxy-test (isolated from development data)
• Config file: test-integration.proxy.config.json (loaded via CONFIG_FILE env var)

Benefits

• Validates real database operations against live MongoDB
• Runs automatically in CI across all MongoDB versions in the test matrix
• Uses isolated test database to avoid conflicts with development data
• Clean test isolation with automatic cleanup between tests

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[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.26%. Comparing base (4a738dc) to head (2290c99).

Files with missing lines	Patch %	Lines
src/db/mongo/helper.ts	25.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1382      +/-   ##
==========================================
- Coverage   81.35%   81.26%   -0.10%     
==========================================
  Files          65       65              
  Lines        4639     4648       +9     
  Branches      792      792              
==========================================
+ Hits         3774     3777       +3     
- Misses        850      856       +6     
  Partials       15       15              

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[grovesy]

@kriswest - Reviewed, looks good to me. Happy to close.

-Paul