func (s *commonMachineSuite) primeAgentWithMachine(c *gc.C, m *state.Machine, vers version.Binary) (*state.Machine, agent.ConfigSetterWriter, *tools.Tools) {
pinger, err := m.SetAgentPresence()
c.Assert(err, jc.ErrorIsNil)
s.AddCleanup(func(c *gc.C) {
c.Assert(worker.Stop(pinger), jc.ErrorIsNil)
})
return s.configureMachine(c, m.Id(), vers)
}