func (s *baseSuite) setAgentPresence(c *gc.C, u *state.Unit) {
_, err := u.SetAgentPresence()
c.Assert(err, jc.ErrorIsNil)
s.State.StartSync()
s.BackingState.StartSync()
err = u.WaitAgentPresence(coretesting.LongWait)
c.Assert(err, jc.ErrorIsNil)
}