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diff --git a/test/lisp/progmodes/autoconf-tests.el b/test/lisp/progmodes/autoconf-tests.el
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+;;; autoconf-tests.el --- Tests for autoconf.el      -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020 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 'autoconf)
+(require 'ert)
+
+(ert-deftest autoconf-tests-current-defun-function-define ()
+  (with-temp-buffer
+    (insert "AC_DEFINE(HAVE_RSVG, 1, [Define to 1 if using librsvg.])")
+    (goto-char (point-min))
+    (should-not (autoconf-current-defun-function))
+    (forward-char 10)
+    (should (equal (autoconf-current-defun-function) "HAVE_RSVG"))))
+
+(ert-deftest autoconf-tests-current-defun-function-subst ()
+  (with-temp-buffer
+    (insert "AC_SUBST(srcdir)")
+    (goto-char (point-min))
+    (should-not (autoconf-current-defun-function))
+    (forward-char 9)
+    (should (equal (autoconf-current-defun-function) "srcdir"))))
+
+(ert-deftest autoconf-tests-autoconf-mode-comment-syntax ()
+  (with-temp-buffer
+    (autoconf-mode)
+    (insert "dnl  Autoconf script for GNU Emacs")
+    (should (nth 4 (syntax-ppss)))))
+
+(provide 'autoconf-tests)
+;;; autoconf-tests.el ends here