},
		Spec: networking.IngressSpec{
			DefaultBackend: &defaultBackend,
		},
	}

	testCases := map[string]struct {
		tweakIngresses func(newIngress, oldIngress *networking.Ingress)
		expectedErrs   field.ErrorList
	}{
		"class field set": {
			tweakIngresses: func(newIngress, oldIngress *networking.Ingress) {
				newIngress.Spec.IngressClassName = utilpointer.String("bar")
			},