Slightly tangential but one of the largest problems I’ve had working with React Testing Library is a huge number of tests that pass when they should fail. This might be because of me and my team misusing it but regularly a test will be written, seem like it’s testing something, and pass but if you flip the condition, or break the component it doesn’t fail as expected. I’d really worry that any mass automated, or honestly manual, method for test conversion would result in a large percentage of tests which seem to be of value but actually just pass without testing anything.