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diff --git a/test/lisp/progmodes/asm-mode-tests.el b/test/lisp/progmodes/asm-mode-tests.el
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+;;; asm-mode-tests.el --- Tests for asm-mode.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019-2022 Free Software Foundation, Inc.
+
+;; Author: Simen Heggestøyl <simenheg@gmail.com>
+;; Keywords:
+
+;; 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/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'asm-mode)
+(require 'ert)
+
+(defmacro asm-mode-tests--with-temp-buffer (&rest body)
+  "Create a temporary Asm mode buffer and evaluate BODY there."
+  (declare (indent 0))
+  `(with-temp-buffer
+     (let ((asm-comment-char ?\;))
+       (asm-mode)
+       ,@body)))
+
+(ert-deftest asm-mode-tests-colon ()
+  (asm-mode-tests--with-temp-buffer
+    (let ((indent-tabs-mode t))
+      (insert "\t  label")
+      (let ((last-command-event ?:))
+        (asm-colon))
+      (should (equal (buffer-string) "label:\t")))))
+
+(ert-deftest asm-mode-tests-colon-inside-comment ()
+  (asm-mode-tests--with-temp-buffer
+    (insert ";comment")
+    (let ((last-command-event ?:))
+      (asm-colon))
+    (should (equal (buffer-string) ";comment:"))))
+
+(ert-deftest asm-mode-tests-comment ()
+  (asm-mode-tests--with-temp-buffer
+    (insert "label:")
+    (goto-char (point-min))
+    ;; First invocation
+    (asm-comment)
+    (should (string-match-p "label:[ \t]+;" (buffer-string)))
+    (should (= (current-column) (+ comment-column 1)))
+    ;; Second invocation
+    (asm-comment)
+    (should (string-match-p "[ \t]+;; \nlabel:" (buffer-string)))
+    (should (= (current-column) (+ tab-width 3)))
+    ;; Third invocation
+    (asm-comment)
+    (should (string-match-p ";;; \nlabel:" (buffer-string)))
+    (should (= (current-column) 4))))
+
+(ert-deftest asm-mode-tests-fill-comment ()
+  (asm-mode-tests--with-temp-buffer
+    (call-interactively #'comment-dwim)
+    (insert "Pellentesque condimentum, magna ut suscipit hendrerit, \
+ipsum augue ornare nulla, non luctus diam neque sit amet urna.")
+    (call-interactively #'fill-paragraph)
+    (should (equal (buffer-string) "\t;; Pellentesque condimentum, \
+magna ut suscipit hendrerit,\n\t;; ipsum augue ornare nulla, non \
+luctus diam neque sit amet\n\t;; urna."))))
+
+;;; asm-mode-tests.el ends here