appengine is not saving - google-app-engine

Question

For some reason nothing gets saved when the test code below is run. I have other api methods that when run (not through tests, this is just the first test) do save.
When I check the database stats via localhost:8000, it can be seen that nothing is being inserted.
Update: After copying and pasting the code below and wrapping it is GET request handler with some hardcoded data it does save to the database. So this seems like an issue with the testing aetest.Context that is used. I have added the code for the NewTestHandler helper code.
Method to create the context within the tests
func NewTestHandler(handlerFunc func(appengine.Context, http.ResponseWriter, *http.Request)) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
c, _ := aetest.NewContext(nil)
handlerFunc(c, w, r)
})
}
Error (update: the key that is generated returns 0 when calling .IntId())
// happens in the .Get() error handling
--- err datastore: internal error: server returned the wrong number of entities
Model
package app
import "time"
type League struct {
Name string `json:"name"`
Location string `json:"location"`
CreatedAt time.Time
}
Code
func (api *LeagueApi) Create(c appengine.Context, w http.ResponseWriter, r *http.Request) {
// data
var league League
json.NewDecoder(r.Body).Decode(&league)
defer r.Body.Close()
// save to db
key := datastore.NewIncompleteKey(c, "leagues", nil)
if _, err := datastore.Put(c, key, &league); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
var leagueCheck League
if err := datastore.Get(c, key, &leagueCheck); err != nil {
log.Println("--- err", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// json response
if err := json.NewEncoder(w).Encode(league); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
Test
func Test_LeagueReturnedOnCreate(t *testing.T) {
league := League{Name: "foobar"}
data, _ := json.Marshal(league)
reader := bytes.NewReader(data)
// setup request and writer
r, _ := http.NewRequest("POST", "/leagues", reader)
w := httptest.NewRecorder()
// make request
api := LeagueApi{}
handler := tux.NewTestHandler(api.Create)
handler.ServeHTTP(w, r)
// extract api response
var leagueCheck League
json.NewDecoder(w.Body).Decode(&leagueCheck)
if leagueCheck.Name != "foobar" {
t.Error("should return the league")
}
// ensure the league is in the db
}