def METHOD_NAME(self):
    # This tests for the error described in
    # https://github.com/zopefoundation/ZODB/issues/45
    db1 = DB(self._storage)
    db2 = DB(None, databases=db1.databases, database_name='2')
    db1.open().get_connection('2')
    db1.close()
    db2.close()