test suite for js/js-export/ASTutils.js (sugarlabs#4457)

* test suite for js/js-export/ASTutils.js

* Exporting modules for test

Author: omsuneri

js/js-export/ASTutils.js

@@ -765,3 +765,6 @@ class ASTUtils {
         return AST;
     }
 }
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = ASTUtils;
+}