I want to write tests for handlers in Google App Engine that use Gorilla mux to read variables from the request URL.
I understand from the documentation that you can create a fake context and request to use with testing.
I'm calling the handler directly in the test but the handler isn't seeing the path parameter as expected.
func TestRouter(t *testing.T) {
inst, _ := aetest.NewInstance(nil) //ignoring error for brevity
defer inst.Close()
//tried adding this line because the test would not work with or without it
httptest.NewServer(makeRouter())
req, _ := inst.NewRequest("GET", "/user/john@example.com/id-123", nil)
req.Header.Add("X-Requested-With", "XMLHttpRequest")
resp := httptest.NewRecorder()
restHandler(resp, req)
}
func restHandler(w http.ResponseWriter, r *http.Request) {
ctx := appengine.NewContext(r)
params := mux.Vars(r)
email := params["email"]
//`email` is always empty
}
The problem is that the handler always sees an empty "email" parameter because the path is not interpreted by Gorilla mux.
The router is as below:
func makeRouter() *mux.Router {
r := mux.Router()
rest := mux.NewRouter().Headers("Authorization", "").
PathPrefix("/api").Subrouter()
app := r.Headers("X-Requested-With", "XMLHttpRequest").Subrouter()
app.HandleFunc("/user/{email}/{id}", restHandler).Methods(http.MethodGet)
//using negroni for path prefix /api
r.PathPrefx("/api").Handler(negroni.New(
negroni.HandlerFunc(authCheck), //for access control
negroni.Wrap(rest),
))
return r
}
All my searches have not gotten anything specific to App Engine unit testing with Gorilla mux.