diff --git a/test/flatten-array.js b/test/flatten-array.js
index c7f0632..e699460 100644
--- a/test/flatten-array.js
+++ b/test/flatten-array.js
@@ -2,7 +2,9 @@ describe('flatten array', function () {
   it('should flatten an array', function () {
     var arr = [1, 2, [1, 2, [3, 4, 5, [1]]], 2, [2]],
         expected = [1, 1, 1, 2, 2, 2, 2, 3, 4, 5];
+        arr = arr.flat(Infinity);
+        arr.sort();
 
     expect(arr).toEqual(expected);
   });
-});
\ No newline at end of file
+});