Came out of this code review comment. The mochalite framework makes tests easier to reason about – it's easier to understand which use-cases fail and which succeed. We can use https://github.com/10gen/mongo/blob/b2a2dd3d80361462255d5930dd1aa5bb7a32ae89/jstests/sharding/query/change_streams/change_stream_v2_smoke.js as a reference.