[WIP] Add extensive unit tests for core logic and utilities

[Copilot]

• Explore repository structure and understand codebase
• Identify functions that need unit testing
• Verify current build/lint setup works
• Install and configure Jest with TypeScript support for ES modules
• Create tests/ directory structure
• Set up mocking infrastructure for GitHub API interactions
• Add unit tests for core utilities in src/utils.ts
• Add unit tests for product/version logic in src/github-products.ts
• Add unit tests for helpers in src/commands/import.ts
• Ensure good coverage of edge cases and error handling
• Add npm script to run unit tests
• Document how to run tests in CONTRIBUTING.md

---

💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click here to start the survey.

[timrogers]

@copilot Try again - you got stuck on the test setup last time, so try taking a step back

[Copilot]

@copilot Try again - you got stuck on the test setup last time, so try taking a step back

Taking a step back and trying a simpler approach. Instead of struggling with Jest + TypeScript + ES modules configuration, I'll use Node.js built-in test runner which works well with ES modules out of the box.