You only need JassHelper if you use vJass, so JNGP's "Test Map" works fine without saving before as long as you don't use vJass.Anyway, the reason your test map isn't working is because with JNGP you MUST save your map directly before you hit the test button, so jasshelper can compile your code. If you make the slightest change to anything after saving, then hit test, it'll bring you to the opening wc3 screen. Simply save before hitting test everytime.