Basically all the examples of LLM's building impressive things have been because they have human written tests to base the implementation on. If you have an LLM write the tests the results are far less impressive or valuable.
I just asked it for a code snippet and it ended up setting up a whole repo in a docker container or something.
Even volunteered a test suite. This genuinely amazed me.
...until I checked the tests.
It was just console.log("Tests passed!")
AGI 2027