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diff --git a/test/lisp/tab-bar-tests.el b/test/lisp/tab-bar-tests.el
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+;;; tab-bar-tests.el --- Tests for tab-bar.el          -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021-2022 Free Software Foundation, Inc.
+
+;; Author: Juri Linkov <juri@linkov.net>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+
+(defun tab-bar-tests-close-other-tabs (arg)
+  (tab-bar-tabs-set nil)
+  (tab-rename "1")
+  (tab-new) (tab-rename "2") ;; (tab-switch "2")
+  (tab-new) (tab-rename "3") ;; (tab-switch "3")
+  (should (eq (length (tab-bar-tabs)) 3))
+  (should (equal (alist-get 'name (tab-bar--current-tab-find)) "3"))
+  (tab-bar-close-other-tabs arg)
+  (should (equal (alist-get 'name (tab-bar--current-tab-find))
+                 (if arg (number-to-string (max 1 (min arg 3))) "3")))
+  (should (eq (length (tab-bar-tabs)) 1))
+  (should (eq (length tab-bar-closed-tabs) 2))
+  (tab-undo)
+  (tab-undo)
+  (should (equal (tab-undo) "No more closed tabs to undo"))
+  (should (eq (length (tab-bar-tabs)) 3))
+  (should (eq (length tab-bar-closed-tabs) 0)))
+
+(ert-deftest tab-bar-tests-close-other-tabs-default ()
+  (tab-bar-tests-close-other-tabs nil))
+
+(ert-deftest tab-bar-tests-close-other-tabs-with-arg ()
+  (dotimes (i 5) (tab-bar-tests-close-other-tabs i)))
+
+(provide 'tab-bar-tests)
+;;; tab-bar-tests.el ends here