Just a thought.

If your project has good coverage with tests, it should be possible to develop an algorithm that recreates your production code entirely from tests.

Just look at IntelliJ - its autosuggestions on missing properties/methods are 99% times correct - I only need to hit that ENTER button. Add some AI to recreate some algorithms and there you go - you can use your tests as both: code specs and a part of QA.

Any takers for the next AI project? :)