How do you migrate 600,000 JUnit 4 tests covering 15 million lines of code (!!) to JUnit 5 - a not trivial migration at all? Pre-AI, I have no idea how, beyond a LOT of manual migration work; and try to automate some of it. With AI, it's suddenly very doable. Details from @UberEng at https://uber.com/us/en/blog/junit-migrat…