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;;; finalizer-tests.el --- Finalizer tests -*- lexical-binding: t -*-
;; Copyright (C) 2015 Free Software Foundation, Inc.
;; Author: Daniel Colascione <dancol@dancol.org>
;; Keywords:
;; 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/>.
;;; Commentary:
;;
;;; Code:
(require 'ert)
(require 'cl-lib)
(ert-deftest finalizer-basic ()
"Test that finalizers run at all."
(skip-unless gc-precise)
(let* ((finalized nil)
(finalizer (make-finalizer (lambda () (setf finalized t)))))
(garbage-collect)
(should (equal finalized nil))
(setf finalizer nil)
(garbage-collect)
(should (equal finalized t))))
(ert-deftest finalizer-circular-reference ()
"Test references from a callback to a finalizer."
(skip-unless gc-precise)
(let ((finalized nil))
(let* ((value nil)
(finalizer (make-finalizer (lambda () (setf finalized value)))))
(setf value finalizer)
(setf finalizer nil))
(garbage-collect)
(should finalized)))
(ert-deftest finalizer-cross-reference ()
"Test that between-finalizer references do not prevent collection."
(skip-unless gc-precise)
(let ((d nil) (fc 0))
(let* ((f1-data (cons nil nil))
(f2-data (cons nil nil))
(f1 (make-finalizer
(lambda () (cl-incf fc) (setf d f1-data))))
(f2 (make-finalizer
(lambda () (cl-incf fc) (setf d f2-data)))))
(setcar f1-data f2)
(setcar f2-data f1))
(garbage-collect)
(should (equal fc 2))))
(ert-deftest finalizer-error ()
"Test that finalizer errors are suppressed"
(skip-unless gc-precise)
(make-finalizer (lambda () (error "ABCDEF")))
(garbage-collect)
(with-current-buffer "*Messages*"
(save-excursion
(goto-char (point-max))
(forward-line -1)
(should (equal
(buffer-substring (point) (point-at-eol))
"finalizer failed: (error \"ABCDEF\")")))))
(ert-deftest finalizer-object-type ()
(should (equal (type-of (make-finalizer nil)) 'finalizer)))
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