o.objMap[h] = obj
	o.keySlice = append(o.keySlice, h)
}

// size reports the length of o.
func (o *ObjectSet) size() int {
	return len(o.keySlice)
}

// nameMatches returns a subset of o where objects names match the given regex.
func (o *ObjectSet) nameMatches(nameRegex string) *ObjectSet {
	ret := &ObjectSet{}
	for k, v := range o.objMap {
		_, _, objName := object.FromHash(k)
		m, err := regexp.MatchString(nameRegex, objName)

		g.Expect(objs.kind(name.ServiceStr).labels("istio=ingressgateway").size()).Should(Equal(3))
		g.Expect(objs.kind(name.RoleStr).nameMatches(".*gateway.*").size()).Should(Equal(3))
		g.Expect(objs.kind(name.RoleBindingStr).nameMatches(".*gateway.*").size()).Should(Equal(3))
		g.Expect(objs.kind(name.SAStr).nameMatches(".*gateway.*").size()).Should(Equal(3))

		dobj := mustGetDeployment(g, objs, "istio-ingressgateway")
		d := dobj.Unstructured()