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diff --git a/modules/mod-test/test.el b/modules/mod-test/test.el
new file mode 100644
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+++ b/modules/mod-test/test.el
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+;;; Test GNU Emacs modules.
+
+;; Copyright 2015 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/>.  */
+
+(require 'ert)
+
+(add-to-list 'load-path
+             (file-name-directory (or #$ (expand-file-name (buffer-file-name)))))
+(require 'mod-test)
+
+;;
+;; Basic tests.
+;;
+
+(ert-deftest mod-test-sum-test ()
+  (should (= (mod-test-sum 1 2) 3))
+  (let ((descr (should-error (mod-test-sum 1 2 3))))
+    (should (eq (car descr) 'wrong-number-of-arguments))
+    (should (stringp (nth 1 descr)))
+    (should (eq 0
+                (string-match
+                 (concat "#<module function "
+                         "\\(at \\(0x\\)?[0-9a-fA-F]+\\( from .*\\)?"
+                         "\\|Fmod_test_sum from .*\\)>")
+                 (nth 1 descr))))
+    (should (= (nth 2 descr) 3)))
+  (should-error (mod-test-sum "1" 2) :type 'wrong-type-argument)
+  (should-error (mod-test-sum 1 "2") :type 'wrong-type-argument)
+  ;; The following tests are for 32-bit build --with-wide-int.
+  (should (= (mod-test-sum -1 most-positive-fixnum)
+             (1- most-positive-fixnum)))
+  (should (= (mod-test-sum 1 most-negative-fixnum)
+             (1+ most-negative-fixnum)))
+  (when (< #x1fffffff most-positive-fixnum)
+    (should (= (mod-test-sum 1 #x1fffffff)
+               (1+ #x1fffffff)))
+    (should (= (mod-test-sum -1 #x20000000)
+               #x1fffffff)))
+  (should-error (mod-test-sum 1 most-positive-fixnum)
+                :type 'overflow-error)
+  (should-error (mod-test-sum -1 most-negative-fixnum)
+                :type 'overflow-error))
+
+(ert-deftest mod-test-sum-docstring ()
+  (should (string= (documentation 'mod-test-sum) "Return A + B")))
+
+;;
+;; Non-local exists (throw, signal).
+;;
+
+(ert-deftest mod-test-non-local-exit-signal-test ()
+  (should-error (mod-test-signal)))
+
+(ert-deftest mod-test-non-local-exit-throw-test ()
+  (should (equal
+           (catch 'tag
+             (mod-test-throw)
+             (ert-fail "expected throw"))
+           65)))
+
+(ert-deftest mod-test-non-local-exit-funcall-normal ()
+  (should (equal (mod-test-non-local-exit-funcall (lambda () 23))
+                 23)))
+
+(ert-deftest mod-test-non-local-exit-funcall-signal ()
+  (should (equal (mod-test-non-local-exit-funcall
+                  (lambda () (signal 'error '(32))))
+                 '(signal error (32)))))
+
+(ert-deftest mod-test-non-local-exit-funcall-throw ()
+  (should (equal (mod-test-non-local-exit-funcall (lambda () (throw 'tag 32)))
+                 '(throw tag 32))))
+
+;;
+;; String tests.
+;;
+
+(defun multiply-string (s n)
+  (let ((res ""))
+    (dotimes (i n res)
+      (setq res (concat res s)))))
+
+(ert-deftest mod-test-globref-make-test ()
+  (let ((mod-str (mod-test-globref-make))
+        (ref-str (multiply-string "abcdefghijklmnopqrstuvwxyz" 100)))
+    (garbage-collect) ;; XXX: not enough to really test but it's something..
+    (should (string= ref-str mod-str))))
+
+(ert-deftest mod-test-string-a-to-b-test ()
+  (should (string= (mod-test-string-a-to-b "aaa") "bbb")))
+
+;;
+;; User-pointer tests.
+;;
+
+(ert-deftest mod-test-userptr-fun-test ()
+  (let* ((n 42)
+         (v (mod-test-userptr-make n))
+         (r (mod-test-userptr-get v)))
+
+    (should (eq (type-of v) 'user-ptr))
+    (should (integerp r))
+    (should (= r n))))
+
+;; TODO: try to test finalizer
+
+;;
+;; Vector tests.
+;;
+
+(ert-deftest mod-test-vector-test ()
+  (dolist (s '(2 10 100 1000))
+    (dolist (e '(42 foo "foo"))
+      (let* ((v-ref (make-vector 2 e))
+             (eq-ref (eq (aref v-ref 0) (aref v-ref 1)))
+             (v-test (make-vector s nil)))
+
+        (should (eq (mod-test-vector-fill v-test e) t))
+        (should (eq (mod-test-vector-eq v-test e) eq-ref))))))