It will come around, we have rudimentary computer use agents and ability to record UIs for LLM agents. They will me refined and the agent can test UIs as well.

For UIs I do a different trick - live diagnostic tests - I ask the agent to write tests that run in the app itself, check consistencies, constraints and expected behaviors. Having the app running in its natural state makes it easier to test, you can have complex constraints encoded in your diagnostics.