question: public void test_emptyJournal ( ) throws IOException , InterruptedException , ExecutionException { final File out = File . createTempFile ( getName ( ) , Options . JNL ) ; try { final Journal src = getStore ( getProperties ( ) ) ; try { final Future < Map < String , BaseIndexStats > > f = src . warmUp ( null ) ; final Map < String , BaseIndexStats > map = f . get ( ) ; assertEquals ( 0 , map . size ( ) ) ; } finally { src . destroy ( ) ; } } finally { out . delete ( ) ; } }
target:  Verify operation Ok when nothing has been written on the journal.