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diff --git a/test/lisp/align-tests.el b/test/lisp/align-tests.el
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+;;; align-tests.el --- Test suite for aligns  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2015-2022 Free Software Foundation, Inc.
+
+;; 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 'ert)
+(require 'ert-x)
+(require 'align)
+
+(defun test-align-compare (file function)
+  (should (equal
+           (with-temp-buffer
+             (insert-file-contents (ert-resource-file (format file "pre")))
+             (funcall function)
+             (align (point-min) (point-max))
+             (buffer-substring-no-properties (point-min) (point-max)))
+           (with-temp-buffer
+             (insert-file-contents (ert-resource-file (format file "post")))
+             (buffer-string)))))
+
+(ert-deftest align-java ()
+  (test-align-compare "align-%s.java" #'java-mode))
+
+(ert-deftest align-c ()
+  (test-align-compare "align-%s.c" #'c-mode))
+
+(provide 'align-tests)
+
+;;; align-tests.el ends here