error testing api handler

applications/api.moon

@@ -23,6 +23,9 @@ class API extends Application
   handle_error: (err, trace) =>
     return status: 500, json: { errors: {err}, :trace } -- NOTE trace should be saved and NOT returned to the user
 
+  [err_test: "/err"]: =>
+    error!
+
   [new: "/new"]: capture_errors_json json_params =>
     assert_valid @params, {
       {"content", exists: true, min_length: 1, "Task content not specified."}