s.Spec.IPFamilies = []core.IPFamily{core.IPv4Protocol, core.IPv6Protocol, core.IPv4Protocol}
			},
			numErrs: 1,
		}, {
			name: "invalid, service with same ip families",
			tweakSvc: func(s *core.Service) {
				s.Spec.IPFamilyPolicy = &requireDualStack
				s.Spec.IPFamilies = []core.IPFamily{core.IPv6Protocol, core.IPv6Protocol}
			},
			numErrs: 1,
		}, {