func removeModel(c *gc.C, st *state.State) {
	apps, err := st.AllApplications()
	c.Assert(err, gc.IsNil)
	for _, app := range apps {
		units, err := app.AllUnits()
		c.Assert(err, gc.IsNil)
		for _, unit := range units {
			err := unit.Destroy()
			c.Assert(err, gc.IsNil)
			err = unit.EnsureDead()
			c.Assert(err, gc.IsNil)
			err = unit.Remove()
			c.Assert(err, gc.IsNil)
		}
		err = app.Destroy()
		c.Assert(err, gc.IsNil)
	}
	machines, err := st.AllMachines()
	c.Assert(err, gc.IsNil)
	for _, machine := range machines {
		err = machine.Destroy()
		c.Assert(err, gc.IsNil)
		err = machine.EnsureDead()
		c.Assert(err, gc.IsNil)
		err = machine.Remove()
		c.Assert(err, gc.IsNil)
	}
	model, err := st.Model()
	c.Assert(err, gc.IsNil)
	err = model.Destroy()
	c.Assert(err, gc.IsNil)
	err = st.RemoveAllModelDocs()
	c.Assert(err, gc.IsNil)
}