"In more general terms, almost every database we tested with Jepsen fails, sometimes in dozens of ways, before its test suite passes. That's how we know Jepsen

"In more general terms, almost every database we tested with Jepsen fails, sometimes in dozens of ways, before its test suite passes. That's how we know Jepsen is working! The vendor headline that comes out of that process is usually "X passes Jepsen"." Read between the lines.