set.Status.CollisionCount = new(int32)
	currentSet := set.DeepCopy()
	currentRevision, err := newRevision(set, 1, set.Status.CollisionCount)
	if err != nil {
		t.Fatal(err)
	}

	set.Spec.Template.Spec.Containers[0].Env = []v1.EnvVar{{Name: "foo", Value: "bar"}}
	updateSet := set.DeepCopy()
	updateRevision, err := newRevision(set, 2, set.Status.CollisionCount)
	if err != nil {
		t.Fatal(err)
	}

	specCopy["template"] = template
	template["$patch"] = "replace"
	objCopy["spec"] = specCopy
	patch, err := json.Marshal(objCopy)
	return patch, err
}

// newRevision creates a new ControllerRevision containing a patch that reapplies the target state of set.
// The Revision of the returned ControllerRevision is set to revision. If the returned error is nil, the returned

	var collisionCount int32
	if set.Status.CollisionCount != nil {
		collisionCount = *set.Status.CollisionCount
	}

	// create a new revision from the current set
	updateRevision, err := newRevision(set, nextRevision(revisions), &collisionCount)
	if err != nil {
		return nil, nil, collisionCount, err
	}

	// find any equivalent revisions
	equalRevisions := history.FindEqualRevisions(revisions, updateRevision)

	// The recheck occurs in the presence of a matching orphan.
	pod := newStatefulSetPod(set, 1)
	pod.OwnerReferences = nil
	om.podsIndexer.Add(pod)
	set.Status.CollisionCount = new(int32)
	revision, err := newRevision(set, 1, set.Status.CollisionCount)
	if err != nil {
		t.Fatal(err)
	}
	revision.OwnerReferences = nil
	_, err = ssh.CreateControllerRevision(set, revision, set.Status.CollisionCount)
	if err != nil {

		if err != nil {
			return err
		}
	}
	return invariants(set, om)
}

func newRevisionOrDie(set *apps.StatefulSet, revision int64) *apps.ControllerRevision {
	rev, err := newRevision(set, revision, set.Status.CollisionCount)
	if err != nil {
		panic(err)
	}
	return rev
}

func isOrHasInternalError(err error) bool {
	if err == nil {
		return false
	}