;;; custom-tests.el --- tests for custom.el  -*- lexical-binding: t -*-

;; Copyright (C) 2018-2021 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 this program.  If not, see <https://www.gnu.org/licenses/>.

;;; Code:

(require 'ert)
(require 'ert-x)

(require 'wid-edit)
(require 'cus-edit)
(require 'seq) ; For `seq-find'.

(ert-deftest custom-theme--load-path ()
  "Test `custom-theme--load-path' behavior."
  (let ((tmpdir (file-name-as-directory (make-temp-file "custom-tests-" t))))
    (unwind-protect
        ;; Create all temporary files under the same deletable parent.
        (let ((temporary-file-directory tmpdir))
          ;; Path is empty.
          (let ((custom-theme-load-path ()))
            (should (null (custom-theme--load-path))))

          ;; Path comprises non-existent file.
          (let* ((name (make-temp-name tmpdir))
                 (custom-theme-load-path (list name)))
            (should (not (file-exists-p name)))
            (should (null (custom-theme--load-path))))

          ;; Path comprises existing file.
          (let* ((file (make-temp-file "file"))
                 (custom-theme-load-path (list file)))
            (should (file-exists-p file))
            (should (not (file-directory-p file)))
            (should (null (custom-theme--load-path))))

          ;; Path comprises existing directory.
          (let* ((dir (make-temp-file "dir" t))
                 (custom-theme-load-path (list dir)))
            (should (file-directory-p dir))
            (should (equal (custom-theme--load-path) custom-theme-load-path)))

          ;; Expand `custom-theme-directory' path element.
          (let ((custom-theme-load-path '(custom-theme-directory)))
            (let ((custom-theme-directory (make-temp-name tmpdir)))
              (should (not (file-exists-p custom-theme-directory)))
              (should (null (custom-theme--load-path))))
            (let ((custom-theme-directory (make-temp-file "file")))
              (should (file-exists-p custom-theme-directory))
              (should (not (file-directory-p custom-theme-directory)))
              (should (null (custom-theme--load-path))))
            (let ((custom-theme-directory (make-temp-file "dir" t)))
              (should (file-directory-p custom-theme-directory))
              (should (equal (custom-theme--load-path)
                             (list custom-theme-directory)))))

          ;; Expand t path element.
          (let ((custom-theme-load-path '(t)))
            (let ((data-directory (make-temp-name tmpdir)))
              (should (not (file-exists-p data-directory)))
              (should (null (custom-theme--load-path))))
            (let ((data-directory tmpdir)
                  (themedir (expand-file-name "themes" tmpdir)))
              (should (not (file-exists-p themedir)))
              (should (null (custom-theme--load-path)))
              (with-temp-file themedir)
              (should (file-exists-p themedir))
              (should (not (file-directory-p themedir)))
              (should (null (custom-theme--load-path)))
              (delete-file themedir)
              (make-directory themedir)
              (should (file-directory-p themedir))
              (should (equal (custom-theme--load-path) (list themedir))))))
      (when (file-directory-p tmpdir)
        (delete-directory tmpdir t)))))

(defcustom custom--test-user-option 'foo
  "User option for test."
  :group 'emacs
  :type 'symbol)

(defvar custom--test-variable 'foo
  "Variable for test.")

;; This is demonstrating bug#34027.
(ert-deftest custom--test-theme-variables ()
  "Test variables setting with enabling / disabling a custom theme."
  ;; We load custom-resources/custom--test-theme.el.
  (let ((custom-theme-load-path `(,(ert-resource-directory))))
    (load-theme 'custom--test 'no-confirm 'no-enable)
    ;; The variables have still their initial values.
    (should (equal custom--test-user-option 'foo))
    (should (equal custom--test-variable 'foo))

    (custom-set-variables
     '(custom--test-user-option 'baz)
     '(custom--test-variable 'baz))
    ;; The initial values have been changed.
    (should (equal custom--test-user-option 'baz))
    (should (equal custom--test-variable 'baz))

    ;; Enable and then disable.
    (enable-theme 'custom--test)
    (disable-theme 'custom--test)
    ;; The variables should have the changed values, by reverting.
    (should (equal custom--test-user-option 'baz))
    (should (equal custom--test-variable 'baz))))

;; This tests Bug#5358.
(ert-deftest custom-test-show-comment-preserves-changes ()
  "Test that adding a comment doesn't discard modifications in progress."
  (customize-option 'custom--test-user-option)
  (let* ((field (seq-find (lambda (widget)
                            (eq custom--test-user-option (widget-value widget)))
                          widget-field-list))
         (parent (widget-get field :parent))
	 (origvalue (widget-value field)))
    ;; Move to the end of the text of the widget, and modify it.  This
    ;; modification should be preserved after showing the comment field.
    (goto-char (widget-field-text-end field))
    (insert "bar")
    (custom-comment-show parent)
    ;; From now on, must use `widget-at' to get the value of the widget.
    (should-not (eq origvalue (widget-value (widget-at))))
    (should (eq (widget-get parent :custom-state) 'modified))
    (should (eq (widget-value (widget-at))
                (widget-apply field
                              :value-to-external
                              (concat
                               (widget-apply field :value-to-internal origvalue)
                               "bar"))))))

(defconst custom-test-admin-cus-test
  (expand-file-name "admin/cus-test.el" source-directory))

(declare-function cus-test-opts custom-test-admin-cus-test)

(ert-deftest check-for-wrong-custom-types ()
  :tags '(:expensive-test)
  (skip-unless (file-readable-p custom-test-admin-cus-test))
  (load custom-test-admin-cus-test)
  (should (null (cus-test-opts t))))

(ert-deftest custom-test-enable-theme-keeps-settings ()
  "Test that enabling a theme doesn't change its settings."
  (let* ((custom-theme-load-path `(,(ert-resource-directory)))
         settings)
    (load-theme 'custom--test 'no-confirm 'no-enable)
    (setq settings (get 'custom--test 'theme-settings))
    (enable-theme 'custom--test)
    (should (equal settings (get 'custom--test 'theme-settings)))))

(defcustom custom--test-local-option 'initial
  "Buffer-local user option for testing."
  :group 'emacs
  :type '(choice (const initial) (const changed))
  :local t)

(defcustom custom--test-permanent-option 'initial
  "Permanently local user option for testing."
  :group 'emacs
  :type '(choice (const initial) (const changed))
  :local 'permanent)

(ert-deftest custom-test-local-option ()
  "Test :local user options."
  ;; Initial default values.
  (should (eq custom--test-local-option 'initial))
  (should (eq custom--test-permanent-option 'initial))
  (should (eq (default-value 'custom--test-local-option) 'initial))
  (should (eq (default-value 'custom--test-permanent-option) 'initial))
  (let ((obuf (current-buffer)))
    (with-temp-buffer
      ;; Changed buffer-local values.
      (setq custom--test-local-option 'changed)
      (setq custom--test-permanent-option 'changed)
      (should (eq custom--test-local-option 'changed))
      (should (eq custom--test-permanent-option 'changed))
      (should (eq (default-value 'custom--test-local-option) 'initial))
      (should (eq (default-value 'custom--test-permanent-option) 'initial))
      (with-current-buffer obuf
        (should (eq custom--test-local-option 'initial))
        (should (eq custom--test-permanent-option 'initial)))
      ;; Permanent variable remains unchanged.
      (kill-all-local-variables)
      (should (eq custom--test-local-option 'initial))
      (should (eq custom--test-permanent-option 'changed))
      (should (eq (default-value 'custom--test-local-option) 'initial))
      (should (eq (default-value 'custom--test-permanent-option) 'initial)))))

;;; custom-tests.el ends here