Backend:  defaultBackend,
							}},
						},
					},
				}}
			},
			expectedErrs: field.ErrorList{},
		},
		"new Backend.Resource allowed on update": {
			tweakIngresses: func(newIngress, oldIngress *networking.Ingress) {
				oldIngress.Spec.DefaultBackend = &defaultBackend
				newIngress.Spec.DefaultBackend = &networking.IngressBackend{