// renew first token 1/2 to expire
Thread.sleep(renewInterval/2);
fsn.renewDelegationToken(token2);
verify(log, times(1)).logRenewDelegationToken(eq(ident2), anyLong());
// force scan and give it a little time to complete
dtsm.stopThreads(); dtsm.startThreads();
Thread.sleep(250);
// no token has expired yet
verify(log, times(0)).logCancelDelegationToken(eq(ident1));
verify(log, times(0)).logCancelDelegationToken(eq(ident2));