if roleBinding.RoleRef.APIGroup != rbac.GroupName {
		allErrs = append(allErrs, field.NotSupported(field.NewPath("roleRef", "apiGroup"), roleBinding.RoleRef.APIGroup, []string{rbac.GroupName}))
	}

	switch roleBinding.RoleRef.Kind {
	case "Role", "ClusterRole":
	default:
		allErrs = append(allErrs, field.NotSupported(field.NewPath("roleRef", "kind"), roleBinding.RoleRef.Kind, []string{"Role", "ClusterRole"}))

		expected *rbacapi.RoleBinding
	}{
		"specific user": {
			old: &v1alpha1.RoleBinding{
				RoleRef:  v1alpha1.RoleRef{Name: "foo", APIGroup: v1alpha1.GroupName},
				Subjects: []v1alpha1.Subject{{Kind: "User", APIVersion: v1alpha1.SchemeGroupVersion.String(), Name: "bob"}},
			},
			expected: &rbacapi.RoleBinding{
				RoleRef:  rbacapi.RoleRef{Name: "foo", APIGroup: v1alpha1.GroupName},

			name: "ClusterRoleBindings already exists",
			client: newMockClusterRoleBinddingClientForTest(t, &rbac.ClusterRoleBinding{
				ObjectMeta: metav1.ObjectMeta{
					Name: constants.NodeKubeletBootstrap,
				},
				RoleRef: rbac.RoleRef{
					APIGroup: rbac.GroupName,
					Kind:     "ClusterRole",
					Name:     constants.NodeBootstrapperClusterRoleName,
				},
				Subjects: []rbac.Subject{
					{
						Kind: rbac.GroupKind,

			F: "roleRef.kind",
		},
		"reference role": {
			A: rbac.ClusterRoleBinding{
				ObjectMeta: metav1.ObjectMeta{Name: "default"},
				RoleRef:    rbac.RoleRef{APIGroup: rbac.GroupName, Kind: "Role", Name: "valid"},
			},
			T: field.ErrorTypeNotSupported,
			F: "roleRef.kind",
		},
		"zero-length name": {
			A: rbac.ClusterRoleBinding{
				ObjectMeta: metav1.ObjectMeta{},

  metadata:
    annotations:
      rbac.authorization.kubernetes.io/autoupdate: "true"
    creationTimestamp: null
    labels:
      kubernetes.io/bootstrapping: rbac-defaults
    name: cluster-admin
  roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: ClusterRole
    name: cluster-admin
  subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: Group
    name: system:masters

	// This occurs after defaulting and conversion, so values pulled from the roleRef won't change
	// Invalid APIGroup or Name values will fail validation
	switch roleRef.Kind {
	case "ClusterRole":
		attrs.APIGroup = roleRef.APIGroup
		attrs.APIVersion = "*"
		attrs.Resource = "clusterroles"
		attrs.Name = roleRef.Name
	case "Role":
		attrs.APIGroup = roleRef.APIGroup
		attrs.APIVersion = "*"
		attrs.Resource = "roles"

	return apiclient.CreateOrUpdateClusterRoleBinding(client, &rbac.ClusterRoleBinding{
		ObjectMeta: metav1.ObjectMeta{
			Name: constants.NodeKubeletBootstrap,
		},
		RoleRef: rbac.RoleRef{
			APIGroup: rbac.GroupName,
			Kind:     "ClusterRole",
			Name:     constants.NodeBootstrapperClusterRoleName,
		},
		Subjects: []rbac.Subject{
			{
				Kind: rbac.GroupKind,

    annotations:
      rbac.authorization.kubernetes.io/autoupdate: "true"
    creationTimestamp: null
    labels:
      kubernetes.io/bootstrapping: rbac-defaults
    name: system:controller:attachdetach-controller
  roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: ClusterRole
    name: system:controller:attachdetach-controller
  subjects:
  - kind: ServiceAccount
    name: attachdetach-controller
    namespace: kube-system

	return RegisterDefaults(scheme)
}

func SetDefaults_ClusterRoleBinding(obj *rbacv1alpha1.ClusterRoleBinding) {
	if len(obj.RoleRef.APIGroup) == 0 {
		obj.RoleRef.APIGroup = GroupName
	}
}
func SetDefaults_RoleBinding(obj *rbacv1alpha1.RoleBinding) {
	if len(obj.RoleRef.APIGroup) == 0 {
		obj.RoleRef.APIGroup = GroupName
	}
}
func SetDefaults_Subject(obj *rbacv1alpha1.Subject) {
	if len(obj.APIVersion) == 0 {

	Subjects []Subject `json:"subjects,omitempty" protobuf:"bytes,2,rep,name=subjects"`

	// RoleRef can reference a Role in the current namespace or a ClusterRole in the global namespace.
	// If the RoleRef cannot be resolved, the Authorizer must return an error.
	// This field is immutable.
	RoleRef RoleRef `json:"roleRef" protobuf:"bytes,3,opt,name=roleRef"`
}

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object