"podSubnet": "10.10.0.0/16",
    "svcSubnet": "10.255.10.0/24",
    "network": "network-1"
  },
  {
    "clusterName": "remote",
    "podSubnet": "10.20.0.0/16",
    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "controlPlaneClusterName": "primary"
  },
  {
    "clusterName": "primary-2",
    "podSubnet": "10.30.0.0/16",
    "svcSubnet": "10.255.30.0/24",
    "network": "network-1"
  },

func TestGetAPIServerVirtualIP(t *testing.T) {
	var tests = []struct {
		name, svcSubnet, expectedIP string
		expectedErr                 bool
	}{
		{
			name:        "subnet mask 24",
			svcSubnet:   "10.96.0.12/24",
			expectedIP:  "10.96.0.1",
			expectedErr: false,
		},
		{
			name:        "subnet mask 12",
			svcSubnet:   "10.96.0.0/12",
			expectedIP:  "10.96.0.1",
			expectedErr: false,
		},

[
  {
    "kind": "Kubernetes",
    "clusterName": "primary",
    "podSubnet": "10.10.0.0/16",
    "svcSubnet": "10.255.10.0/24",
    "network": "network-1"
  },
  {
    "kind": "Kubernetes",
    "clusterName": "remote",
    "podSubnet": "10.20.0.0/16",
    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "primaryClusterName": "primary",
    "meta": {
      "fakeVM": false
    }
  },
  {

[
  {
    "kind": "Kubernetes",
    "clusterName": "config",
    "podSubnet": "10.20.0.0/16",
    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "primaryClusterName": "external",
    "configClusterName": "config"
  },
  {
    "kind": "Kubernetes",
    "clusterName": "remote",
    "podSubnet": "10.30.0.0/16",
    "svcSubnet": "10.255.30.0/24",
    "network": "network-2",
    "primaryClusterName": "external",

  {
    "kind": "Kubernetes",
    "clusterName": "config",
    "podSubnet": "10.20.0.0/16",
    "svcSubnet": "10.255.20.0/24",
    "network": "network-1",
    "primaryClusterName": "external",
    "configClusterName": "config"
  },
  {
    "kind": "Kubernetes",
    "clusterName": "external",
    "podSubnet": "10.10.0.0/16",
    "svcSubnet": "10.255.10.0/24",
    "network": "network-1",
    "primaryClusterName": "external",

[
  {
    "kind": "Kubernetes",
    "clusterName": "istio-testing",
    "podSubnet": "10.10.0.0/16",
    "svcSubnet": "10.255.10.0/24",
    "network": "istio-testing"
  }

		return false, nil, nil
	}

	_, svcSubnet, err := netutils.ParseCIDRSloppy(idr.serviceSubnet)
	if err != nil {
		return true, nil, errors.Wrapf(err, "error parsing CIDR %q", idr.serviceSubnet)
	}

	internalAPIServerVirtualIP, err := netutils.GetIndexedIP(svcSubnet, 1)
	if err != nil {
		return true, nil, errors.Wrapf(err, "unable to get first IP address from the given CIDR (%s)", svcSubnet.String())
	}

			}
		})
	}
}

func TestGetDNSIP(t *testing.T) {
	var tests = []struct {
		name, svcSubnet, expectedDNSIP string
		isDualStack                    bool
	}{
		{
			name:          "subnet mask 12",
			svcSubnet:     "10.96.0.0/12",
			expectedDNSIP: "10.96.0.10",
		},
		{
			name:          "subnet mask 26",
			svcSubnet:     "10.87.116.64/26",
			expectedDNSIP: "10.87.116.74",
		},
		{

	svcSubnet, err := GetKubernetesServiceCIDR(svcSubnetList)
	if err != nil {
		return nil, errors.Wrap(err, "unable to get internal Kubernetes Service IP from the given service CIDR")
	}
	internalAPIServerVirtualIP, err := netutils.GetIndexedIP(svcSubnet, 1)
	if err != nil {
		return nil, errors.Wrapf(err, "unable to get the first IP address from the given CIDR: %s", svcSubnet.String())
	}

# talk to each other directly.
#
# [{ "cluster_name": "cluster1","pod_subnet": "10.10.0.0/16","svc_subnet": "10.255.10.0/24","network_id": "0" },
#  { "cluster_name": "cluster2","pod_subnet": "10.20.0.0/16","svc_subnet": "10.255.20.0/24","network_id": "0" },
#  { "cluster_name": "cluster3","pod_subnet": "10.30.0.0/16","svc_subnet": "10.255.30.0/24","network_id": "1" }]
function load_cluster_topology() {
  CLUSTER_TOPOLOGY_CONFIG_FILE="${1}"