},
		{
			name:         "isIP valid ipv4",
			expr:         `isIP("192.168.0.1")`,
			expectResult: trueVal,
		},
		{
			name:         "isIP invalid ipv4",
			expr:         `isIP("192.168.0.1.0")`,
			expectResult: falseVal,
		},
		{
			name:         "ip.isCanonical valid ipv4",

			if err != nil {
				c.Report(gvk.ValidatingWebhookConfiguration, msg.NewInvalidExternalControlPlaneConfig(r, *clientConf.URL, hName, err.Error()))
				return
			}
			if result.isIP() {
				c.Report(gvk.ValidatingWebhookConfiguration, msg.NewExternalControlPlaneAddressIsNotAHostname(r, *clientConf.URL, hName))
			}
		} else if clientConf.Service == nil {

	f := testKube.NewSinglePodFetch(o.cluster, ns, fmt.Sprintf("app=%s", appName))
	_, err = testKube.WaitUntilPodsAreReady(f)
	if err != nil {
		return nil, err
	}

	isIP := net.ParseIP(c.IngressAddr).String() != "<nil>"
	ingressDomain := c.IngressAddr
	if isIP {
		ingressDomain = fmt.Sprintf("%s.sslip.io", strings.ReplaceAll(c.IngressAddr, ":", "-"))
	}

	err = installServiceEntry(ctx, istioCfg.TelemetryNamespace, ingressDomain)

		// Kubernetes <1.30>:
		"ip", "family", "isUnspecified", "isLoopback", "isLinkLocalMulticast", "isLinkLocalUnicast", "isGlobalUnicast", "ip.isCanonical", "isIP", "cidr", "containsIP", "containsCIDR", "masked", "prefixLength", "isCIDR", "string",
		// Kubernetes <1.??>:
	)

	// TODO: test celgo function lists

	unexpected := functionNames.Difference(knownFunctions)

		return nil, err
	}
	c.forwarder = forwarder
	scopes.Framework.Debugf("initialized zipkin port forwarder: %v", forwarder.Address())

	isIP := net.ParseIP(cfgIn.IngressAddr).String() != "<nil>"
	ingressDomain := cfgIn.IngressAddr
	if isIP {
		ingressDomain = fmt.Sprintf("%s.sslip.io", strings.ReplaceAll(cfgIn.IngressAddr, ":", "-"))
	}

	c.address = fmt.Sprintf("http://tracing.%s", ingressDomain)