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

;; Copyright (C) 2017 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 <http://www.gnu.org/licenses/>.

;;; Code:

(require 'ert)
(eval-when-compile (require 'cl-lib))

(cl-defmacro gv-tests--in-temp-dir ((elvar elcvar)
                                    (&rest filebody)
                                    &rest body)
  (declare (indent 2))
  `(let ((default-directory (make-temp-file "gv-test" t)))
     (unwind-protect
         (let ((,elvar "gv-test-deffoo.el")
               (,elcvar "gv-test-deffoo.elc"))
           (with-temp-file ,elvar
             (insert ";; -*- lexical-binding: t; -*-\n")
             (dolist (form ',filebody)
               (pp form (current-buffer))))
           ,@body)
       (delete-directory default-directory t))))

(ert-deftest gv-define-expander-in-file ()
  (gv-tests--in-temp-dir (el elc)
      ((gv-define-setter gv-test-foo (newval cons)
         `(setcar ,cons ,newval))
       (defvar gv-test-pair (cons 1 2))
       (setf (gv-test-foo gv-test-pair) 99)
       (message "%d" (car gv-test-pair)))
    (with-temp-buffer
      (call-process (concat invocation-directory invocation-name)
                    nil '(t t) nil
                    "-Q" "-batch" "--eval" (prin1-to-string `(byte-compile-file ,el))
                    "-l" elc)
      (should (equal (buffer-string) "99\n")))))

(ert-deftest gv-dont-define-expander-in-file ()
  ;; The expander is defined while we are compiling the file, even
  ;; though it's inside (when nil ...).
  :expected-result :failed
  (gv-tests--in-temp-dir (el elc)
      ((when nil (gv-define-setter gv-test-foo (newval cons)
                   `(setcar ,cons ,newval)))
       (defvar gv-test-pair (cons 1 2))
       (setf (gv-test-foo gv-test-pair) 99)
       (message "%d" (car gv-test-pair)))
    (with-temp-buffer
      (call-process (concat invocation-directory invocation-name)
                    nil '(t t) nil
                    "-Q" "-batch" "--eval" (prin1-to-string `(byte-compile-file ,el))
                    "-l" elc)
      (should (equal (buffer-string)
                     "Symbol's function definition is void: \\(setf\\ gv-test-foo\\)\n")))))

(ert-deftest gv-define-expander-out-of-file ()
  (gv-tests--in-temp-dir (el elc)
      ((gv-define-setter gv-test-foo (newval cons)
         `(setcar ,cons ,newval))
       (defvar gv-test-pair (cons 1 2)))
    (with-temp-buffer
      (call-process (concat invocation-directory invocation-name)
                    nil '(t t) nil
                    "-Q" "-batch" "--eval" (prin1-to-string `(byte-compile-file ,el))
                    "-l" elc
                    "--eval"
                    (prin1-to-string '(progn (setf (gv-test-foo gv-test-pair) 99)
                                             (message "%d" (car gv-test-pair)))))
      (should (equal (buffer-string) "99\n")))))

(ert-deftest gv-dont-define-expander-other-file ()
  (gv-tests--in-temp-dir (el elc)
      ((if nil (gv-define-setter gv-test-foo (newval cons)
                 `(setcar ,cons ,newval)))
       (defvar gv-test-pair (cons 1 2)))
    (with-temp-buffer
      (call-process (concat invocation-directory invocation-name)
                    nil '(t t) nil
                    "-Q" "-batch" "--eval" (prin1-to-string `(byte-compile-file ,el))
                    "-l" elc
                    "--eval"
                    (prin1-to-string '(progn (setf (gv-test-foo gv-test-pair) 99)
                                             (message "%d" (car gv-test-pair)))))
      (should (equal (buffer-string)
                     "Symbol's function definition is void: \\(setf\\ gv-test-foo\\)\n")))))

;;; gv-tests.el ends here