def METHOD_NAME(self):
    """It should be possible to remove vlans by not including them"""
    vlans_from_request = [1, 2]
    old_trunked_vlans = [3]
    allowed_vlans = range(1, 10)
    self.assertEqual(
        filter_vlans(vlans_from_request, old_trunked_vlans, allowed_vlans), [1, 2]
    )