Improve tests (#854)

Recover commented out tests, 
Improve usage of helper in driver, 
Added data-wd-key for test to use instead of classes
Moved all non tsx file to a single folder (lib) instead of lib and utils

---------

Co-authored-by: Yuri Astrakhan <yuriastrakhan@gmail.com>

src/components/FieldMinZoom.tsx

@@ -23,6 +23,7 @@ export default class FieldMinZoom extends React.Component<FieldMinZoomProps> {
         min={latest.layer.minzoom.minimum}
         max={latest.layer.minzoom.maximum}
         default={latest.layer.minzoom.minimum}
+        data-wd-key='min-zoom.input'
       />
     </Block>
   }