If they want something that mimics the common, everyday.. Give the candidate a project with 300,000 loc, tell them to make the most local change possible that

If they want something that mimics the common, everyday.. Give the candidate a project with 300,000 loc, tell them to make the most local change possible that fixes the reported bug. Update the tests to reflect the new logic. Bonus: discuss architectural changes that would have resolved the bug and/or improved performance.