def test_permission_difference():
p1 = Permission(('a', 'b'), ('a', 'c'))
p2 = Permission(('a', 'c'), ('d', 'e'))
p3 = p1.difference(p2)
assert p3.allow == set([('a', 'b')])
p4 = p2.difference(p1)
assert p4.allow == set([('d', 'e')])
def test_permission_or():
p1 = Permission(RolePermit('boss'), RolePermit('lackey'))
p2 = Permission(RolePermit('lackey'), RolePermit('underling'))
p3 = p1 | p2
p4 = p1.difference(p2)
assert p3.allow == p4.allow
