You don't need a full-featured testing framework, or something that outputs in JUnit format, to get the value of a red-green-refactor loop. All you need is a feedback mechanism, which can be as simple as "does the exit code for this process indicate an error or success?". Kent Beck's test-commit-revert demo using python does exactly this - no importing a framework or test runner, but leaning on python's built-in `assert` keyword. https://youtu.be/Aof0F9DvTFg?t=220&si=D7afjzT2GvTEhTQn