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diff --git a/test/lisp/battery-tests.el b/test/lisp/battery-tests.el
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+;;; battery-tests.el --- tests for battery.el -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020 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/>.
+
+;;; Code:
+
+(require 'battery)
+
+(ert-deftest battery-linux-proc-apm-regexp ()
+  "Test `battery-linux-proc-apm-regexp'."
+  (let ((str "1.16 1.2 0x07 0x01 0xff 0x80 -1% -1 ?"))
+    (should (string-match battery-linux-proc-apm-regexp str))
+    (should (equal (match-string 0 str) str))
+    (should (equal (match-string 1 str) "1.16"))
+    (should (equal (match-string 2 str) "1.2"))
+    (should (equal (match-string 3 str) "07"))
+    (should (equal (match-string 4 str) "01"))
+    (should (equal (match-string 5 str) "ff"))
+    (should (equal (match-string 6 str) "80"))
+    (should (equal (match-string 7 str) "-1"))
+    (should (equal (match-string 8 str) "-1"))
+    (should (equal (match-string 9 str) "?")))
+  (let ((str "1.16 1.2 0x03 0x00 0x00 0x01 99% 1792 min"))
+    (should (string-match battery-linux-proc-apm-regexp str))
+    (should (equal (match-string 0 str) str))
+    (should (equal (match-string 1 str) "1.16"))
+    (should (equal (match-string 2 str) "1.2"))
+    (should (equal (match-string 3 str) "03"))
+    (should (equal (match-string 4 str) "00"))
+    (should (equal (match-string 5 str) "00"))
+    (should (equal (match-string 6 str) "01"))
+    (should (equal (match-string 7 str) "99"))
+    (should (equal (match-string 8 str) "1792"))
+    (should (equal (match-string 9 str) "min"))))
+
+(ert-deftest battery-format ()
+  "Test `battery-format'."
+  (should (equal (battery-format "" ()) ""))
+  (should (equal (battery-format "" '((?b . "-"))) ""))
+  (should (equal (battery-format "%a%b%p%%" '((?b . "-") (?p . "99")))
+                 "-99%")))
+
+;;; battery-tests.el ends here