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;;; so-long-tests-helpers.el --- Test suite for so-long.el -*- lexical-binding: t; -*-
;; Copyright (C) 2019-2025 Free Software Foundation, Inc.
;; Author: Phil Sainty <psainty@orcon.net.nz>
;; Keywords: convenience
;; 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 'so-long)
(defvar longlines-mode)
(declare-function longlines-mode "longlines")
(defvar so-long-tests-memory nil
"Original values of minor modes and variables.")
(defun so-long-tests-assert-active (action)
"Assert that ACTION is active."
(cl-destructuring-bind (_key _label actionfunc revertfunc)
(assq action so-long-action-alist)
(should (eq so-long-function actionfunc))
(should (eq so-long-revert-function revertfunc))
(should (eq so-long-enabled t))
(should (eq so-long--active t))
;; pcase fails here in Emacs 24.
(cl-case action
(so-long-mode
(should (eq major-mode 'so-long-mode))
(so-long-tests-assert-overrides)
(so-long-tests-assert-preserved))
(so-long-minor-mode
(should (eq so-long-minor-mode t))
(so-long-tests-assert-overrides))
(longlines-mode
(should (eq longlines-mode t))))))
(defun so-long-tests-assert-reverted (action)
"Assert that ACTION has been reverted."
(cl-destructuring-bind (_key _label actionfunc revertfunc)
(assq action so-long-action-alist)
(should (eq so-long-function actionfunc))
(should (eq so-long-revert-function revertfunc))
(should (eq so-long-enabled t))
(should (eq so-long--active nil))
;; pcase fails here in Emacs 24.
(cl-case action
(so-long-mode
(should-not (eq major-mode 'so-long-mode))
(so-long-tests-assert-overrides-reverted)
(so-long-tests-assert-preserved))
(so-long-minor-mode
(should-not (eq so-long-minor-mode t))
(so-long-tests-assert-overrides-reverted))
(longlines-mode
(should-not (eq longlines-mode t))))))
(defun so-long-tests-assert-and-revert (action)
"Assert ACTION, revert it, and then assert the revert."
(so-long-tests-assert-active action)
(so-long-revert)
(so-long-tests-assert-reverted action))
(defun so-long-tests-assert-overrides ()
"Assert that overridden modes and variables have their expected values."
(dolist (ovar so-long-variable-overrides)
(when (boundp (car ovar))
(should (equal (symbol-value (car ovar)) (cdr ovar)))))
(dolist (mode so-long-minor-modes)
(when (boundp mode)
(should (eq (symbol-value mode) nil)))))
(defun so-long-tests-assert-overrides-reverted ()
"Assert that each remembered variable has its original value."
(dolist (ovar so-long-tests-memory)
(when (boundp (car ovar))
(should (equal (symbol-value (car ovar)) (cdr ovar))))))
(defun so-long-tests-assert-preserved ()
"Assert that preserved modes and variables have their expected values."
(dolist (var so-long-mode-preserved-variables)
(when (boundp var)
(should (equal (symbol-value var)
(alist-get var so-long-tests-memory)))))
(dolist (mode so-long-mode-preserved-minor-modes)
(when (boundp mode)
(should (equal (symbol-value mode)
(alist-get mode so-long-tests-memory))))))
(defun so-long-tests-remember ()
"Remember the original states of modes and variables.
Call this after setting up a buffer in the normal (not `so-long')
state for its major mode, so that after triggering a `so-long'
action we can call `so-long-revert' and compare the reverted
state against this remembered state."
(setq so-long-tests-memory nil)
(push (cons 'major-mode major-mode)
so-long-tests-memory)
(dolist (ovar so-long-variable-overrides)
(when (boundp (car ovar))
(push (cons (car ovar) (symbol-value (car ovar)))
so-long-tests-memory)))
(dolist (mode so-long-minor-modes)
(when (boundp mode)
(push (cons mode (symbol-value mode))
so-long-tests-memory)))
(dolist (var so-long-mode-preserved-variables)
(when (boundp var)
(push (cons var (symbol-value var))
so-long-tests-memory)))
(dolist (mode so-long-mode-preserved-minor-modes)
(when (boundp mode)
(push (cons mode (symbol-value mode))
so-long-tests-memory))))
(defun so-long-tests-predicates ()
"Return the list of testable predicate functions."
(if (fboundp 'buffer-line-statistics)
'(so-long-statistics-excessive-p
so-long-detected-long-line-p)
'(so-long-detected-long-line-p)))
(provide 'so-long-tests-helpers)
;;; so-long-tests-helpers.el ends here
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