svctest.SetIPFamilyPolicy(api.IPFamilyPolicyPreferDualStack)),
					expectPolicy:   api.IPFamilyPolicyPreferDualStack,
					expectFamilies: []api.IPFamily{api.IPv4Protocol},
				}, {
					name: "ClusterIPs:unset_Policy:PreferDualStack_Families:v4",
					line: line(),
					svc: svctest.MakeService("foo",
						svctest.SetIPFamilyPolicy(api.IPFamilyPolicyPreferDualStack),
						svctest.SetIPFamilies(api.IPv4Protocol)),

	// The IPFamily assigned is based on the default IPFamily used by the cluster
	// or as identified by service.spec.ipFamilies field
	IPFamilyPolicySingleStack IPFamilyPolicy = "SingleStack"
	// IPFamilyPolicyPreferDualStack indicates that this service prefers dual-stack when
	// the cluster is configured for dual-stack. If the cluster is not configured
	// for dual-stack the service will be assigned a single IPFamily. If the IPFamily is not

	// The IPFamily assigned is based on the default IPFamily used by the cluster
	// or as identified by service.spec.ipFamilies field
	IPFamilyPolicySingleStack IPFamilyPolicy = "SingleStack"
	// IPFamilyPolicyPreferDualStack indicates that this service prefers dual-stack when
	// the cluster is configured for dual-stack. If the cluster is not configured
	// for dual-stack the service will be assigned a single IPFamily. If the IPFamily is not

var supportedServiceIPFamily = sets.New(core.IPv4Protocol, core.IPv6Protocol)
var supportedServiceIPFamilyPolicy = sets.New(
	core.IPFamilyPolicySingleStack,
	core.IPFamilyPolicyPreferDualStack,
	core.IPFamilyPolicyRequireDualStack)

// ValidateService tests if required fields/annotations of a Service are valid.
func ValidateService(service *core.Service) field.ErrorList {