Added tests for helpers and components. All react components are now ES5.

tests/helpers/changeExtensionTooltip.spec.js

@@ -0,0 +1,10 @@
+var chai = require('chai');
+var expect = chai.expect;
+
+import changeExtensionTooltip from '../../assets/js/helpers/changeExtensionTooltip';
+
+describe('changeExtensionTooltip', function() {
+    it('should be a function', function() {
+        expect(changeExtensionTooltip).to.be.a('function');
+    });
+});