}, {
		name:  "headless",
		input: svctest.MakeService("foo", svctest.SetHeadless),
		expect: svctest.MakeService("foo", svctest.SetHeadless,
			svctest.SetIPFamilyPolicy(api.IPFamilyPolicySingleStack),
			svctest.SetIPFamilies(api.IPv4Protocol)),
	}, {
		name: "headless selectorless",
		input: svctest.MakeService("foo", svctest.SetHeadless,
			svctest.SetSelector(map[string]string{})),

	return api.ServicePort{
		Name:       name,
		Port:       int32(port),
		TargetPort: tgtPort,
		Protocol:   proto,
	}
}

// SetHeadless sets the service as headless and clears other fields.
func SetHeadless(svc *api.Service) {
	SetTypeClusterIP(svc)
	SetClusterIPs(api.ClusterIPNone)(svc)
}

// SetSelector sets the service selector.
func SetSelector(sel map[string]string) Tweak {