def test_findif_existent(br1, br2):
br1.addif(b'eth1')
br2.addif(b'eth2')
res = brctl.findif(b'eth1')
assert res is not None
assert res.name == br1.name
res = brctl.findif(b'eth2')
assert res is not None
assert res.name == br2.name
def test_findif_nonexistent(br1, br2):
br1.addif(b'eth1')
br2.addif(b'eth2')
res = brctl.findif(b'foobar')
assert res is None