// SetupTestGrid creates a new grid for testing purposes.
// Select the number of hosts to create.
// Call (TestGrid).Cleanup() when done.
func SetupTestGrid(n int) (*TestGrid, error) {
	hosts, listeners, err := getHosts(n)
	if err != nil {
		return nil, err
	}
	dialer := &net.Dialer{
		Timeout: 5 * time.Second,
	}
	var res TestGrid
	res.Hosts = hosts
	ready := make(chan struct{})
	ctx, cancel := context.WithCancel(context.Background())

	md["POD_NAMESPACE"] = wg.Namespace
	md["SERVICE_ACCOUNT"] = we.ServiceAccount
	md["TRUST_DOMAIN"] = meshConfig.TrustDomain

	md["ISTIO_META_CLUSTER_ID"] = clusterID
	md["ISTIO_META_MESH_ID"] = meshConfig.DefaultConfig.MeshId
	md["ISTIO_META_NETWORK"] = we.Network
	if portsStr := marshalWorkloadEntryPodPorts(we.Ports); portsStr != "" {
		md["ISTIO_META_POD_PORTS"] = portsStr
	}
	md["ISTIO_META_WORKLOAD_NAME"] = wg.Name