etSuccessfully(t *testing.T) {  th.Mux.HandleFunc("/servers/0000asdf/metadata", func(w http.ResponseWriter, r *http.Request) {   th.TestMethod(t, r, "PUT")   th.TestHeader(t, r, "X-Auth-Token", client.TokenID)   th.TestJSONRequest(t, r, `{     "metadata": {      "foo": "ba