diff --git a/test/lisp/dired-x-tests.el b/test/lisp/dired-x-tests.el
index c6ac7c602ea..69c88c060a1 100644
--- a/test/lisp/dired-x-tests.el
+++ b/test/lisp/dired-x-tests.el
@@ -65,7 +65,10 @@
   (should (= (dired-x--string-to-number "2400") 2400))
   (should (= (dired-x--string-to-number "123.4M") 129394278.4))
   (should (= (dired-x--string-to-number "123.40000M") 129394278.4))
-  (should (= (dired-x--string-to-number "4.134") 4134)))
+  (should (= (dired-x--string-to-number "4.134") 4134))
+  (should (= (dired-x--string-to-number "4,134") 4134))
+  (should (= (dired-x--string-to-number "4 134") 4134))
+  (should (= (dired-x--string-to-number "41,52,134") 4152134)))
 
 (provide 'dired-x-tests)
 ;;; dired-x-tests.el ends here