docs: void checkAllLocks() throws BackendException {
          StoreTransaction lt = getConsistentTx();
          for (ExpectedValueCheckingStore store : expectedValuesByStore.keySet()) {
              Locker locker = store.getLocker();
              // Ignore locks on stores without a locker
              if (null == locker)
                  continue;
              locker.checkLocks(lt);
          }
      }