I think I'd love to use this to generate tests and then write the functions myself. Test generation seems like a killer feature.

Yes!! Totally agree. Imagine writing a method and then telling an AI to write your unit tests for it. The AI would likely be able to come up with the edge cases and such that you would not normally take the time to write.

While I think the AI generating your mainline code is interesting, I must certainly agree that generating test code would be the killer feature. I would like to see this showcased a little more on the copilot page.

You don’t need AI for that. While example based testing is familiar to most, other approaches exist that can achieve this with less complexity. See: property based testing.

Yes, I agree. But just to ask, wouldn't we consider that a form of AI testing, even just in very primitive form? We're begging the question for the very definition of AI. I would argue that your example is just the primordial version of what machine reasoned testing could potentially offer.

Well then you have to check the generated tests. That's just one more layer, isn't it?

If you question the veracity of the code that is produced, you have to question the usefulness of the unit test that is produced.