func (s *clientSuite) assertDestroyMachineSuccess(c *gc.C, u *state.Unit, m0, m1, m2 *state.Machine) {
err := s.APIState.Client().DestroyMachines("0", "1", "2")
c.Assert(err, gc.ErrorMatches, `some machines were not destroyed: machine 0 is required by the model; machine 1 has unit "wordpress/0" assigned`)
assertLife(c, m0, state.Alive)
assertLife(c, m1, state.Alive)
assertLife(c, m2, state.Dying)
err = u.UnassignFromMachine()
c.Assert(err, jc.ErrorIsNil)
err = s.APIState.Client().DestroyMachines("0", "1", "2")
c.Assert(err, gc.ErrorMatches, `some machines were not destroyed: machine 0 is required by the model`)
assertLife(c, m0, state.Alive)
assertLife(c, m1, state.Dying)
assertLife(c, m2, state.Dying)
}