func assertUnitRemoved(c *C, unit *state.Unit) {
err := unit.Refresh()
c.Assert(err, checkers.Satisfies, errors.IsNotFoundError)
err = unit.Destroy()
c.Assert(err, IsNil)
err = unit.EnsureDead()
c.Assert(err, IsNil)
err = unit.Remove()
c.Assert(err, IsNil)
}