If the code outputted does not look like code I cannot maintain in a meaningful way (barring like some algorithm or something specialized) I don't check it in.

If the code outputted does not look like code I cannot maintain in a meaningful way (barring like some algorithm or something specialized) I don't check it in. I treat it as if it were code from Stack Overflow, sometimes its awful code, so I rewrite it if applicable (things change, understandings change), other times it works and makes sense.