def METHOD_NAME(self):
    """
    Failure to get the XML of an external VM while trying lookup
    """
    vm_ext = [True] * len(self.vm_uuids)
    self.conn.domains = _make_domains_collection(
        list(zip(self.vm_uuids, vm_ext)))
    self.conn.domains['a'].XMLDesc = _raise
    self.cif.unknown_vm_ids = list(self.vm_uuids)
    recovery.lookup_external_vms(self.cif)
    assert set(self.cif.vmRequests.keys()) == \
        set(('b',))