Improve identity util test to check reference

Just returning the argument so can check by reference instead of deep
equal

Author: frankychung

test/utils/identity.spec.js

@@ -5,7 +5,7 @@ describe('Utils', () => {
   describe('identity', () => {
     it('should return first argument passed to it', () => {
       var test = { 'a': 1 };
-      expect(identity(test, 'test')).toEqual(test);
+      expect(identity(test, 'test')).toBe(test);
     });
   });
 });