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;;; allout-tests.el --- Tests for allout.el -*- lexical-binding: t -*-
;; Copyright (C) 2020-2021 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'ert)
(require 'allout)
(require 'cl-lib)
(defun allout-tests-obliterate-variable (name)
"Completely unbind variable with NAME."
(if (local-variable-p name (current-buffer)) (kill-local-variable name))
(while (boundp name) (makunbound name)))
(defvar allout-tests-globally-unbound nil
"Fodder for allout resumptions tests -- defvar just for byte compiler.")
(defvar allout-tests-globally-true nil
"Fodder for allout resumptions tests -- defvar just for byte compiler.")
(defvar allout-tests-locally-true nil
"Fodder for allout resumptions tests -- defvar just for byte compiler.")
;; For each resumption case, we also test that the right local/global
;; scopes are affected during resumption effects.
(ert-deftest allout-test-resumption-unbound-return-to-unbound ()
"Previously unbound variables return to the unbound state."
(with-temp-buffer
(allout-tests-obliterate-variable 'allout-tests-globally-unbound)
(allout-add-resumptions '(allout-tests-globally-unbound t))
(should (not (default-boundp 'allout-tests-globally-unbound)))
(should (local-variable-p 'allout-tests-globally-unbound (current-buffer)))
(should (boundp 'allout-tests-globally-unbound))
(should (equal allout-tests-globally-unbound t))
(allout-do-resumptions)
(should (not (local-variable-p 'allout-tests-globally-unbound
(current-buffer))))
(should (not (boundp 'allout-tests-globally-unbound)))))
(ert-deftest allout-test-resumption-variable-resumed ()
"Ensure that variable with prior global value is resumed."
(with-temp-buffer
(allout-tests-obliterate-variable 'allout-tests-globally-true)
(setq allout-tests-globally-true t)
(allout-add-resumptions '(allout-tests-globally-true nil))
(should (equal (default-value 'allout-tests-globally-true) t))
(should (local-variable-p 'allout-tests-globally-true (current-buffer)))
(should (equal allout-tests-globally-true nil))
(allout-do-resumptions)
(should (not (local-variable-p 'allout-tests-globally-true
(current-buffer))))
(should (boundp 'allout-tests-globally-true))
(should (equal allout-tests-globally-true t))))
(ert-deftest allout-test-resumption-prior-value-resumed ()
"Ensure that prior local value is resumed."
(with-temp-buffer
(allout-tests-obliterate-variable 'allout-tests-locally-true)
(setq-local allout-tests-locally-true t)
(cl-assert (not (default-boundp 'allout-tests-locally-true))
nil (concat "Test setup mistake -- variable supposed to"
" not have global binding, but it does."))
(cl-assert (local-variable-p 'allout-tests-locally-true (current-buffer))
nil (concat "Test setup mistake -- variable supposed to have"
" local binding, but it lacks one."))
(allout-add-resumptions '(allout-tests-locally-true nil))
(should (not (default-boundp 'allout-tests-locally-true)))
(should (local-variable-p 'allout-tests-locally-true (current-buffer)))
(should (equal allout-tests-locally-true nil))
(allout-do-resumptions)
(should (boundp 'allout-tests-locally-true))
(should (local-variable-p 'allout-tests-locally-true (current-buffer)))
(should (equal allout-tests-locally-true t))
(should (not (default-boundp 'allout-tests-locally-true)))))
(ert-deftest allout-test-resumption-multiple-holds ()
"Ensure that last of multiple resumptions holds, for various scopes."
(with-temp-buffer
(allout-tests-obliterate-variable 'allout-tests-globally-unbound)
(allout-tests-obliterate-variable 'allout-tests-globally-true)
(setq allout-tests-globally-true t)
(allout-tests-obliterate-variable 'allout-tests-locally-true)
(setq-local allout-tests-locally-true t)
(allout-add-resumptions '(allout-tests-globally-unbound t)
'(allout-tests-globally-true nil)
'(allout-tests-locally-true nil))
(allout-add-resumptions '(allout-tests-globally-unbound 2)
'(allout-tests-globally-true 3)
'(allout-tests-locally-true 4))
;; reestablish many of the basic conditions are maintained after re-add:
(should (not (default-boundp 'allout-tests-globally-unbound)))
(should (local-variable-p 'allout-tests-globally-unbound (current-buffer)))
(should (equal allout-tests-globally-unbound 2))
(should (default-boundp 'allout-tests-globally-true))
(should (local-variable-p 'allout-tests-globally-true (current-buffer)))
(should (equal allout-tests-globally-true 3))
(should (not (default-boundp 'allout-tests-locally-true)))
(should (local-variable-p 'allout-tests-locally-true (current-buffer)))
(should (equal allout-tests-locally-true 4))
(allout-do-resumptions)
(should (not (local-variable-p 'allout-tests-globally-unbound
(current-buffer))))
(should (not (boundp 'allout-tests-globally-unbound)))
(should (not (local-variable-p 'allout-tests-globally-true
(current-buffer))))
(should (boundp 'allout-tests-globally-true))
(should (equal allout-tests-globally-true t))
(should (boundp 'allout-tests-locally-true))
(should (local-variable-p 'allout-tests-locally-true (current-buffer)))
(should (equal allout-tests-locally-true t))
(should (not (default-boundp 'allout-tests-locally-true)))))
(ert-deftest allout-test-resumption-unbinding ()
"Ensure that deliberately unbinding registered variables doesn't foul things."
(with-temp-buffer
(allout-tests-obliterate-variable 'allout-tests-globally-unbound)
(allout-tests-obliterate-variable 'allout-tests-globally-true)
(setq allout-tests-globally-true t)
(allout-tests-obliterate-variable 'allout-tests-locally-true)
(setq-local allout-tests-locally-true t)
(allout-add-resumptions '(allout-tests-globally-unbound t)
'(allout-tests-globally-true nil)
'(allout-tests-locally-true nil))
(allout-tests-obliterate-variable 'allout-tests-globally-unbound)
(allout-tests-obliterate-variable 'allout-tests-globally-true)
(allout-tests-obliterate-variable 'allout-tests-locally-true)
(allout-do-resumptions)))
(provide 'allout-tests)
;;; allout-tests.el ends here
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