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;;; savehist-tests.el --- Tests for savehist.el -*- lexical-binding:t -*-
;; Copyright (C) 2025-2026 Free Software Foundation, Inc.
;; Author: Stephane Marks <shipmints@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:
;; These tests emulate what `read-from-minibuffer' would do via
;; `savehist-minibuffer-hook' without calling `read-from-minibuffer'.
;;; Code:
(require 'ert)
(require 'ert-x)
(require 'savehist)
(ert-deftest savehist-test-saved-variables ()
;; These accommodate symbol-value.
(defvar savehist-tests--t1)
(defvar savehist-tests--t2)
(ert-with-temp-file tmpfile
(with-suppressed-warnings ((obsolete savehist-loaded))
(let* ((savehist-file tmpfile)
(savehist-save-minibuffer-history t)
(savehist-save-hook)
(savehist-loaded)
(savehist-minibuffer-history-variables)
(savehist-additional-variables '(savehist-tests--t2))
(savehist-ignored-variables '(t3))
(savehist-tests--t1 '("t1-value"))
(savehist-tests--t2 '("t2-value"))
(t3 '("t3-value"))
(t1-copy (copy-tree savehist-tests--t1))
(t2-copy (copy-tree savehist-tests--t2))
(_t3-copy (copy-tree t3))
(save-var (lambda (x)
(let ((minibuffer-history-variable x))
(savehist-minibuffer-hook)))))
(savehist-mode)
(funcall save-var 'savehist-tests--t1)
(funcall save-var 'savehist-tests--t2)
(funcall save-var 't3) ; should be ignored
(savehist-save)
(setq savehist-tests--t1 nil savehist-tests--t2 nil t3 nil)
(progn
;; Force reloading the file.
(savehist-mode -1)
(setq savehist-loaded nil)
(savehist-mode))
(should (equal savehist-tests--t1 t1-copy))
(should (equal savehist-tests--t2 t2-copy))
(should (equal t3 nil))))))
(ert-deftest savehist-test-duplicated-saved-symbols ()
(defvar savehist-tests--t1)
(defvar savehist-tests--t2)
(ert-with-temp-file tmpfile
(with-suppressed-warnings ((obsolete savehist-loaded))
(let* ((savehist-file tmpfile)
(savehist-save-minibuffer-history t)
(savehist-save-hook)
(savehist-loaded)
;; Will be '(savehist-tests--t2 savehist-tests--t1)
(savehist-minibuffer-history-variables)
;; `savehist-tests--t2' should not be saved twice.
(savehist-additional-variables '(savehist-tests--t2))
(savehist-tests--t1 '("t1-value"))
(savehist-tests--t2 '("t2-value"))
(save-var (lambda (x)
(let ((minibuffer-history-variable x))
(savehist-minibuffer-hook)))))
(savehist-mode)
(funcall save-var 'savehist-tests--t1)
(funcall save-var 'savehist-tests--t2)
(savehist-save)
(progn
;; Force reloading the file.
(savehist-mode -1)
(setq savehist-loaded nil)
(savehist-mode))
(let ((saved-variables))
(with-temp-buffer
(insert-file-contents tmpfile)
(goto-char 1)
;; alnum bypasses savehist-minibuffer-history-variables
(while (re-search-forward "(setq \\([[:alnum:]]+\\) " nil t 1)
(push (match-string 1) saved-variables)))
(should (= (length saved-variables)
(length (seq-uniq saved-variables #'equal)))))))))
(provide 'savehist-tests)
;;; savehist-tests.el ends here
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