Hi all, As described in KAFKA-7438 <https://issues.apache.org/jira/browse/KAFKA-7438>, EasyMock's development has stagnated. This presents a number of issues:
1. Blocks us from running tests with newer Java versions, which is a frequent occurrence give the new Java release cadence. It is the main blocker in switching Jenkins from Java 10 to Java 11 at the moment. 2. Integration with newer testing libraries like JUnit 5 is slow to appear (if it appears at all). 3. No API improvements. Mockito started as an EasyMock fork, but has continued to evolve and, in my opinion, it's more intuitive now. I think we should switch to Mockito for new tests and to incrementally migrate the existing ones as time allows. To make the proposal concrete, I went ahead and converted all the tests in the `clients` module: https://github.com/apache/kafka/pull/5691 I think the updated tests are nicely readable. I also removed PowerMock from the `clients` tests as we didn't really need it and its development has also stagnated a few months ago. I think we can easily remove PowerMock elsewhere with the exception of `Connect` where we may need to keep it for a while. Let me know your thoughts. Aside from the general future direction, I'd like to get the PR for KAFKA-7439 reviewed and merged soonish as merge conflicts will creep in quickly. Ismael
