In fact, the test framework I was using at the time (jest) did in fact support this. But the person who had originally written the tests hadn't had the foresight to use snapshot tests for this failing test!
I don't know if your message is a continuation of the sarcasm (I feel like maybe no?), but I'm pretty sure parent's joke is that if you just change the expected values whenever the code changes, you aren't really effectively "testing" anything as much as "recording" outputs.