Suggestion

Post-Vitest Migration: Fixes & Improvements

• Fix path-related issues.
• Replace .each with the new .for syntax to allow running the tests concurrently via vitest --sequence.concurrent=true, which does speed up local testing.
• Refactor remaining loops to use .for syntax.
• Utilize custom matchers API.
• Remove jest-diff.

Additional Info

I will submit a PR for this shortly.