Add test file lost when merged from Gnus in 2016

diff --git a/test/lisp/gnus/gnus-util-tests.el b/test/lisp/gnus/gnus-util-tests.el
new file mode 100644 (file)
index 0000000..b01e2fc
--- /dev/null
+++ b/test/lisp/gnus/gnus-util-tests.el
@@ -0,0 +1,76 @@
+;;; gnus-util-tests.el --- Selectived tests only.
+;; Copyright (C) 2015-2020 Free Software Foundation, Inc.
+
+;; Author: Jens Lechtenbörger <jens.lechtenboerger@fsfe.org>
+
+;; This file is not 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, 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 'gnus-util)
+
+(ert-deftest gnus-subsetp ()
+  ;; False for non-lists.
+  (should-not (gnus-subsetp "1" "1"))
+  (should-not (gnus-subsetp "1" '("1")))
+  (should-not (gnus-subsetp '("1") "1"))
+
+  ;; Real tests.
+  (should (gnus-subsetp '() '()))
+  (should (gnus-subsetp '() '("1")))
+  (should (gnus-subsetp '("1") '("1")))
+  (should (gnus-subsetp '(42) '("1" 42)))
+  (should (gnus-subsetp '(42) '(42 "1")))
+  (should (gnus-subsetp '(42) '("1" 42 2)))
+  (should-not (gnus-subsetp '("1") '()))
+  (should-not (gnus-subsetp '("1") '(2)))
+  (should-not (gnus-subsetp '("1" 2) '(2)))
+  (should-not (gnus-subsetp '(2 "1") '(2)))
+  (should-not (gnus-subsetp '("1" 2) '(2 3)))
+
+  ;; Duplicates don't matter for sets.
+  (should (gnus-subsetp '("1" "1") '("1")))
+  (should (gnus-subsetp '("1" 2 "1") '(2 "1")))
+  (should (gnus-subsetp '("1" 2 "1") '(2 "1" "1" 2)))
+  (should-not (gnus-subsetp '("1" 2 "1" 3) '(2 "1" "1" 2))))
+
+(ert-deftest gnus-setdiff ()
+  ;; False for non-lists.
+  (should-not (gnus-setdiff "1" "1"))
+  (should-not (gnus-setdiff "1" '()))
+  (should-not (gnus-setdiff '() "1"))
+
+  ;; Real tests.
+  (should-not (gnus-setdiff '() '()))
+  (should-not (gnus-setdiff '() '("1")))
+  (should-not (gnus-setdiff '("1") '("1")))
+  (should (equal '("1") (gnus-setdiff '("1") '())))
+  (should (equal '("1") (gnus-setdiff '("1") '(2))))
+  (should (equal '("1") (gnus-setdiff '("1" 2) '(2))))
+  (should (equal '("1") (gnus-setdiff '("1" 2 3) '(3 2))))
+  (should (equal '("1") (gnus-setdiff '(2 "1" 3) '(3 2))))
+  (should (equal '("1") (gnus-setdiff '(2 3 "1") '(3 2))))
+  (should (equal '(2 "1") (gnus-setdiff '(2 3 "1") '(3))))
+
+  ;; Duplicates aren't touched for sets if they are not removed.
+  (should-not (gnus-setdiff '("1" "1") '("1")))
+  (should (equal '("1") (gnus-setdiff '(2 "1" 2) '(2))))
+  (should (equal '("1" "1") (gnus-setdiff '(2 "1" 2 "1") '(2)))))
+
+;;; gnustest-gnus-util.el ends here