func (s *linkLayerDevicesStateSuite) checkSetDeviceMatchesMachineIDAndModelUUID(c *gc.C, setDevice *state.LinkLayerDevice, machineID, modelUUID string) { globalKey := fmt.Sprintf("m#%s#d#%s", machineID, setDevice.Name()) c.Check(setDevice.DocID(), gc.Equals, modelUUID+":"+globalKey) c.Check(setDevice.MachineID(), gc.Equals, machineID) }