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;;; shortdoc-tests.el --- tests for shortdoc.el -*- lexical-binding: t -*-
;; Copyright (C) 2021-2024 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)
(require 'shortdoc)
(require 'subr-x) ; `string-pad' in shortdoc group needed at run time
(require 'regexp-opt) ; `regexp-opt-charset' not autoloaded
(defun shortdoc-tests--tree-contains (tree fun)
"Whether TREE contains a call to FUN."
(and (proper-list-p tree)
(or (eq (car tree) fun)
(cl-some (lambda (x) (shortdoc-tests--tree-contains x fun)) tree))))
(ert-deftest shortdoc-examples ()
"Check that each example actually contains the corresponding form."
(dolist (group shortdoc--groups)
(dolist (item group)
(when (consp item)
(let ((fun (car item))
(props (cdr item)))
(while props
(when (memq (car props) '(:eval :no-eval :no-eval* :no-value))
(let* ((example (cadr props))
(expr (cond
((consp example) example)
((stringp example) (read example)))))
(should (shortdoc-tests--tree-contains expr fun))))
(setq props (cddr props))))))))
(ert-deftest shortdoc-all-functions-fboundp ()
"Check that all functions listed in shortdoc groups are `fboundp'."
(dolist (group shortdoc--groups)
(dolist (item group)
(when (consp item)
(let ((fun (car item)))
(should (fboundp fun)))))))
(ert-deftest shortdoc-all-groups-work ()
"Test that all defined shortdoc groups display correctly."
(dolist (group (mapcar (lambda (x) (car x)) shortdoc--groups))
(let ((buf-name (format "*Shortdoc %s*" group)) buf)
(unwind-protect
(progn
(shortdoc-display-group group)
(should (setq buf (get-buffer buf-name))))
(when buf
(kill-buffer buf))))))
(defun shortdoc-tests--to-ascii (x)
"Translate Unicode arrows to ASCII for making the test work everywhere."
(cond ((consp x)
(cons (shortdoc-tests--to-ascii (car x))
(shortdoc-tests--to-ascii (cdr x))))
((stringp x)
(thread-last x
(string-replace "⇒" "=>")
(string-replace "→" "->")))
(t x)))
(ert-deftest shortdoc-function-examples-test ()
"Test the extraction of usage examples of some Elisp functions."
(should (equal '((list . "(delete 2 (list 1 2 3 4))\n => (1 3 4)\n (delete \"a\" (list \"a\" \"b\" \"c\" \"d\"))\n => (\"b\" \"c\" \"d\")"))
(shortdoc-tests--to-ascii
(shortdoc-function-examples 'delete))))
(should (equal '((alist . "(assq 'foo '((foo . bar) (zot . baz)))\n => (foo . bar)")
(list . "(assq 'b '((a . 1) (b . 2)))\n => (b . 2)"))
(shortdoc-tests--to-ascii
(shortdoc-function-examples 'assq))))
(should (equal '((regexp . "(string-match-p \"^[fo]+\" \"foobar\")\n => 0"))
(shortdoc-tests--to-ascii
(shortdoc-function-examples 'string-match-p)))))
(ert-deftest shortdoc-help-fns-examples-function-test ()
"Test that `shortdoc-help-fns-examples-function' correctly prints ELisp function examples."
(with-temp-buffer
(shortdoc-help-fns-examples-function 'string-fill)
(should (equal "\n Examples:\n\n (string-fill \"Three short words\" 12)\n => \"Three short\\nwords\"\n (string-fill \"Long-word\" 3)\n => \"Long-word\"\n\n"
(shortdoc-tests--to-ascii
(buffer-substring-no-properties (point-min) (point-max)))))
(erase-buffer)
(shortdoc-help-fns-examples-function 'assq)
(should (equal "\n Examples:\n\n (assq 'foo '((foo . bar) (zot . baz)))\n => (foo . bar)\n\n (assq 'b '((a . 1) (b . 2)))\n => (b . 2)\n\n"
(shortdoc-tests--to-ascii
(buffer-substring-no-properties (point-min) (point-max)))))
(erase-buffer)
(shortdoc-help-fns-examples-function 'string-trim)
(should (equal "\n Example:\n\n (string-trim \" foo \")\n => \"foo\"\n\n"
(shortdoc-tests--to-ascii
(buffer-substring-no-properties (point-min)
(point-max)))))))
(provide 'shortdoc-tests)
;;; shortdoc-tests.el ends here
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