code.delx.au - gnu-emacs/blob - test/automated/finalizer-tests.el

   1 ;;; finalizer-tests.el --- Finalizer tests -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Daniel Colascione <dancol@dancol.org>
   6 ;; Keywords:
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;
  26
  27 ;;; Code:
  28
  29 (require 'ert)
  30 (require 'cl-lib)
  31
  32 (ert-deftest finalizer-basic ()
  33   "Test that finalizers run at all."
  34   (skip-unless gc-precise)
  35   (let* ((finalized nil)
  36          (finalizer (make-finalizer (lambda () (setf finalized t)))))
  37     (garbage-collect)
  38     (should (equal finalized nil))
  39     (setf finalizer nil)
  40     (garbage-collect)
  41     (should (equal finalized t))))
  42
  43 (ert-deftest finalizer-circular-reference ()
  44   "Test references from a callback to a finalizer."
  45   (skip-unless gc-precise)
  46   (let ((finalized nil))
  47     (let* ((value nil)
  48            (finalizer (make-finalizer (lambda () (setf finalized value)))))
  49       (setf value finalizer)
  50       (setf finalizer nil))
  51     (garbage-collect)
  52     (should finalized)))
  53
  54 (ert-deftest finalizer-cross-reference ()
  55   "Test that between-finalizer references do not prevent collection."
  56   (skip-unless gc-precise)
  57   (let ((d nil) (fc 0))
  58     (let* ((f1-data (cons nil nil))
  59            (f2-data (cons nil nil))
  60            (f1 (make-finalizer
  61                 (lambda () (cl-incf fc) (setf d f1-data))))
  62            (f2 (make-finalizer
  63                 (lambda () (cl-incf fc) (setf d f2-data)))))
  64       (setcar f1-data f2)
  65       (setcar f2-data f1))
  66     (garbage-collect)
  67     (should (equal fc 2))))
  68
  69 (ert-deftest finalizer-error ()
  70   "Test that finalizer errors are suppressed"
  71   (skip-unless gc-precise)
  72   (make-finalizer (lambda () (error "ABCDEF")))
  73   (garbage-collect)
  74   (with-current-buffer "*Messages*"
  75     (save-excursion
  76       (goto-char (point-max))
  77       (forward-line -1)
  78       (should (equal
  79                (buffer-substring (point) (point-at-eol))
  80                "finalizer failed: (error \"ABCDEF\")")))))
  81
  82 (ert-deftest finalizer-object-type ()
  83   (should (equal (type-of (make-finalizer nil)) 'finalizer)))