func TestGatewayHostnames(t *testing.T) {
	test.SetForTest(t, &model.MinGatewayTTL, 30*time.Millisecond)
	ttl := uint32(0) // second

	gwHost := "test.gw.istio.io"
	workingDNSServer := newFakeDNSServer(ttl, sets.New(gwHost))
	failingDNSServer := newFakeDNSServer(ttl, sets.NewWithLength[string](0))
	failingDNSServer.setFailure(true)
	model.NetworkGatewayTestDNSServers = []string{