# Task ID: 19
# Title: Implement Comprehensive Testing Suite
# Status: pending
# Dependencies: 1, 5, 16
# Priority: high
# Description: Develop a comprehensive testing suite including unit tests, integration tests, and end-to-end tests.
# Details:
1. Set up Jest for testing framework
2. Create unit tests for all modules and functions
3. Implement integration tests for API endpoints using 'supertest' (npm install supertest)
4. Develop end-to-end tests for complete workflows
5. Set up test coverage reporting using 'istanbul' (npm install nyc)
6. Implement mock tests for rate limiting and other external dependencies
7. Create a CI pipeline for automated testing
# Test Strategy:
1. Ensure all tests are isolated and repeatable
2. Aim for >80% test coverage
3. Include both positive and negative test cases
4. Verify all edge cases and error scenarios are covered
