LLMs in the Loop: Using AI to Migrate JUnit Tests

JUnit 5 was released in late 2017, and since then the migration from JUnit 4 has been written about extensively, so much so that, at first glance, it may feel like an old and well-trodden topic. JUnit usage statistics Yet in reality, the chart makes it clear that JUnit 4 is still very much alive in the ecosystem. According to Libraries.io, JUnit 4 has 91.5K dependent packages and 29.3K dependent repositories.