1 files changed, 20 insertions, 0 deletions

diff --git a/test/lisp/replace-tests.el b/test/lisp/replace-tests.el
index 40a1a31cf7c..40ee838e679 100644
--- a/test/lisp/replace-tests.el
+++ b/test/lisp/replace-tests.el
@@ -399,5 +399,25 @@ Each element has the format:
       ;; After undo text must be the same.
       (should (string= text (buffer-string))))))
 
+(ert-deftest query-replace-undo-bug31492 ()
+  "Test for https://debbugs.gnu.org/31492 ."
+  (let ((text "a\nb\nc\n")
+        (count 0)
+        (inhibit-message t))
+    (with-temp-buffer
+      (insert text)
+      (goto-char 1)
+      (cl-letf (((symbol-function 'read-event)
+                 (lambda (&rest args)
+                   (cl-incf count)
+                   (let ((val (pcase count
+                                ((or 1 2) ?\s) ; replace current and go next
+                                (3 ?U) ; undo-all
+                                (_ ?q)))) ; exit
+                     val))))
+        (perform-replace "^\\|\b\\|$" "foo" t t nil))
+      ;; After undo text must be the same.
+      (should (string= text (buffer-string))))))
+
 
 ;;; replace-tests.el ends here