Use lexical-binding in misc.el and add tests

* lisp/misc.el: Use lexical-binding.
* test/lisp/misc-tests.el: New file.

lisp/misc.el

@@ -1,4 +1,4 @@
-;;; misc.el --- some nonstandard editing and utility commands for Emacs
+;;; misc.el --- some nonstandard editing and utility commands for Emacs  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 1989, 2001-2020 Free Software Foundation, Inc.
 

test/lisp/misc-tests.el

@@ -0,0 +1,77 @@
+;;; misc-tests.el --- Tests for misc.el  -*- lexical-binding:t -*-
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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)
+
+(defmacro with-misc-test (original result &rest body)
+  (declare (indent 2))
+  `(with-temp-buffer
+     (insert ,original)
+     ,@body
+     (should (equal (buffer-string) ,result))))
+
+(ert-deftest misc-test-copy-from-above-command ()
+  (with-misc-test "abc\n" "abc\nabc"
+    (copy-from-above-command))
+  (with-misc-test "abc\n" "abc\nab"
+    (copy-from-above-command 2)))
+
+(ert-deftest misc-test-zap-up-to-char ()
+  (with-misc-test "abcde" "cde"
+    (goto-char (point-min))
+    (zap-up-to-char 1 ?c))
+  (with-misc-test "abcde abc123" "c123"
+    (goto-char (point-min))
+    (zap-up-to-char 2 ?c)))
+
+(ert-deftest misc-test-upcase-char ()
+  (with-misc-test "abcde" "aBCDe"
+    (goto-char (1+ (point-min)))
+    (upcase-char 3)))
+
+(ert-deftest misc-test-forward-to-word ()
+  (with-temp-buffer
+    (insert "    -   abc")
+    (goto-char (point-min))
+    (forward-to-word 1)
+    (should (equal (point) 9)))
+  (with-temp-buffer
+    (insert "a b c")
+    (goto-char (point-min))
+    (forward-to-word 3)
+    (should (equal (point) 6))))
+
+(ert-deftest misc-test-backward-to-word ()
+  (with-temp-buffer
+    (insert "abc    -   ")
+    (backward-to-word 1)
+    (should (equal (point) 4)))
+  (with-temp-buffer
+    (insert "a b c")
+    (backward-to-word 3)
+    (should (equal (point) 1))))
+
+(provide 'misc-tests)
+;;; misc-tests.el ends here