add StatusUnprocessableEntity constant

github/github.go

@@ -23,6 +23,11 @@ import (
 	"github.com/google/go-querystring/query"
 )
 
+const (
+	// StatusUnprocessableEntity is the status code returned when sending a request with invalid fields.
+	StatusUnprocessableEntity = 422
+)
+
 const (
 	libraryVersion = "0.1"
 	defaultBaseURL = "https://api.github.com/"

github/orgs_teams_test.go

@@ -384,7 +384,7 @@ func TestOrganizationsService_AddTeamRepo_noAccess(t *testing.T) {
 
 	mux.HandleFunc("/teams/1/repos/o/r", func(w http.ResponseWriter, r *http.Request) {
 		testMethod(t, r, "PUT")
-		w.WriteHeader(422)
+		w.WriteHeader(StatusUnprocessableEntity)
 	})
 
 	_, err := client.Organizations.AddTeamRepo(1, "o", "r", nil)