diff --git a/js/module.js b/js/module.js
index b12f6cd4..dfd5f2bc 100644
--- a/js/module.js
+++ b/js/module.js
@@ -416,6 +416,10 @@ Module.register = function (name, moduleDefinition) {
 	Module.definitions[name] = moduleDefinition;
 };
 
-exports._test = {
-	cmpVersions: cmpVersions
+if (typeof exports != "undefined") { // For testing purpose only
+	// A good a idea move the function cmpversions a helper file.
+	// It's used into other side.
+	exports._test = {
+		cmpVersions: cmpVersions
+	}
 }