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;;; charset-tests.el --- Tests for charset.c -*- lexical-binding: t -*-
;; Copyright 2017-2026 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 'ert)
(ert-deftest charset-decode-char ()
"Test `decode-char'."
(should-error (decode-char 'ascii 0.5)))
(ert-deftest charset-tests-charsetp ()
(should (charsetp 'ascii))
(should (charsetp 'unicode))
(should-not (charsetp 'charset-tests-no-such-charset)))
(ert-deftest charset-tests-charset-id-internal ()
(let ((id (charset-id-internal 'ascii)))
(should (integerp id))
(should (<= 0 id))))
(ert-deftest charset-tests-charset-plist ()
(let ((plist (charset-plist 'ascii)))
(should (listp plist))
(should (stringp (plist-get plist :short-name)))))
(ert-deftest charset-tests-charset-priority-list ()
(let ((list (charset-priority-list)))
(should (listp list))
(should (consp list))
(should (memq 'ascii list))
(dolist (cs list)
(should (charsetp cs))))
(let ((highest (charset-priority-list t)))
(should (symbolp highest))
(should (charsetp highest))))
(ert-deftest charset-tests-charset-after ()
(with-temp-buffer
(insert "a")
(goto-char (point-min))
(should (eq (charset-after) 'ascii))
(should-not (charset-after (1+ (point-max))))))
(ert-deftest charset-tests-find-charset-string ()
(let ((charsets (find-charset-string "abc")))
(should (memq 'ascii charsets))
(dolist (cs charsets)
(should (charsetp cs))))
(let ((charsets (find-charset-string "あ")))
(should (consp charsets))
(dolist (cs charsets)
(should (charsetp cs)))))
(ert-deftest charset-tests-find-charset-region ()
(with-temp-buffer
(insert "abc")
(let ((charsets (find-charset-region (point-min) (point-max))))
(should (memq 'ascii charsets))
(dolist (cs charsets)
(should (charsetp cs))))))
(ert-deftest charset-tests--map-charset-chars ()
(let (chars)
(map-charset-chars (lambda (range _arg)
(setq chars (append chars
(number-sequence
(car range) (cdr range)))))
'ascii nil 65 67)
(setq chars (sort (delete-dups chars) #'<))
(should (equal chars '(65 66 67)))))
(ert-deftest charset-tests--define-charset-internal-errors ()
(should-error (define-charset-internal)))
(defvar charset-tests--internal-counter 0)
(ert-deftest charset-tests--define-charset-alias ()
(let ((alias (intern (format "charset-tests--alias-%d"
(setq charset-tests--internal-counter
(1+ charset-tests--internal-counter))))))
(define-charset-alias alias 'ascii)
(should (charsetp alias))))
(ert-deftest charset-tests--set-charset-plist ()
(let ((orig (charset-plist 'ascii)))
(unwind-protect
(progn
(set-charset-plist 'ascii '(:charset-tests t))
(should (equal (charset-plist 'ascii) '(:charset-tests t))))
(set-charset-plist 'ascii orig))))
(ert-deftest charset-tests--unify-charset-error ()
(should-error (unify-charset 'ascii)))
(ert-deftest charset-tests--get-unused-iso-final-char ()
(let ((val (get-unused-iso-final-char 1 94)))
(when val
(should (<= ?0 val))
(should (<= val ??)))))
(ert-deftest charset-tests--declare-equiv-charset ()
(should-not (declare-equiv-charset 1 94 ?B 'ascii))
(should (eq (iso-charset 1 94 ?B) 'ascii)))
(ert-deftest charset-tests--split-char ()
(let ((parts (split-char ?A)))
(should (eq (car parts) 'ascii))
(should (equal (cdr parts) '(65)))))
(ert-deftest charset-tests--iso-charset ()
(should (eq (iso-charset 1 94 ?B) 'ascii)))
(ert-deftest charset-tests--clear-charset-maps ()
(should-not (clear-charset-maps)))
(ert-deftest charset-tests--set-charset-priority ()
(let ((orig (charset-priority-list)))
(unwind-protect
(progn
(set-charset-priority 'unicode)
(should (eq (charset-priority-list t) 'unicode)))
(apply #'set-charset-priority orig))))
(ert-deftest charset-tests--sort-charsets ()
(let* ((priority (charset-priority-list))
(a (car priority))
(b (cadr priority)))
(skip-unless (and a b))
(let ((sorted (sort-charsets (list b a))))
(should (equal sorted (list a b))))))
(provide 'charset-tests)
;;; charset-tests.el ends here
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