Adds health check and test

routes/route_model_test.go

@@ -87,7 +87,7 @@ type errorStore struct {
 	error error
 }
 
-func getErrorModel() *models.Model {
-	e := &errorStore{error: fmt.Errorf("Model always errors")}
+func getErrorModel(errorMsg string) *models.Model {
+	e := &errorStore{error: fmt.Errorf(errorMsg)}
 	return models.New(e)
 }