func (s *LifeSuite) prepareFixture(living state.Living, lfix lifeFixture, cached, dbinitial state.Life, c *gc.C) {
	collName, id := lfix.id()
	coll := s.MgoSuite.Session.DB("juju").C(collName)

	err := coll.UpdateId(id, bson.D{{"$set", bson.D{
		{"life", cached},
	}}})
	c.Assert(err, jc.ErrorIsNil)
	err = living.Refresh()
	c.Assert(err, jc.ErrorIsNil)

	err = coll.UpdateId(id, bson.D{{"$set", bson.D{
		{"life", dbinitial},
	}}})
	c.Assert(err, jc.ErrorIsNil)
}

func assertRemoved(c *gc.C, entity state.Living) {
	err := entity.Refresh()
	c.Assert(err, jc.Satisfies, errors.IsNotFound)
	err = entity.Destroy()
	c.Assert(err, jc.ErrorIsNil)
	if entity, ok := entity.(state.AgentLiving); ok {
		err = entity.EnsureDead()
		c.Assert(err, jc.ErrorIsNil)
		err = entity.Remove()
		c.Assert(err, jc.ErrorIsNil)
	}
}

func assertLife(c *gc.C, entity state.Living, life state.Life) {
	err := entity.Refresh()
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(entity.Life(), gc.Equals, life)
}

func assertLife(c *gc.C, entity state.Living, life state.Life) {
	c.Assert(entity.Refresh(), gc.IsNil)
	c.Assert(entity.Life(), gc.Equals, life)
}

func assertRemoved(c *gc.C, entity state.Living) {
	err := entity.Refresh()
	c.Assert(err, jc.Satisfies, errors.IsNotFound)
}