Usually you don't want a UT to log, but there was a lot of System.out in there..,

After converting those to log.info, what I wanted basically to have them easily spotted in (already UT class specific) log file. Eventually, those "dumps" should be replaced with proper assertions (not only assert non-null, but expected key and value?), like this one here:
https://github.com/kazukidb/kazuki/blob/master/src/test/java/io/kazuki/v0/store/journal/PartitionedJournalStoreSmokeTest.java#L114