def __init__(self, backend, cls):
        self.cls = cls
        self.backend = backend
Test for adding masquerade
dataset/ETHPy150Open adewes/blitzdb/blitzdb/queryset.py/QuerySet.__init__--crossover with--dataset/ETHPy150Open saltstack/salt/tests/unit/modules/firewalld_test.py/FirewalldTestCase.test_add_masquerade