I can write an HTML form, then prompt copilot to generate a serializable class that can be used to deserialize that form on the server. I can write a test for one of our internal apis, and for every subsequent test I can just write the name of what I expect it to check and it generates a test that correctly uses our internal APIs and verifies the expected behavior.
You can have problems with the ethics of how GitHub and OpenAI produced what they did, but to describe it the way that you did requires never having really attempted to use it seriously.