Code: [paste]. Which
behaviours genuinely need
tests, which would test the
language rather than my logic,
and write the three tests
catching likely failures.

Decide What's Worth Testing

Three tests that matter, and the ones not worth writing.

Prompt

Here's the code: [paste it]. Tell me which behaviours genuinely need tests, which would be testing the language rather than my logic, and write the three tests that would catch the failures most likely to actually happen.