diff --git a/src/testdir/test_marks.ok b/src/testdir/test_marks.ok
new file mode 100644
index 0000000..dd1a3e4
--- /dev/null
+++ b/src/testdir/test_marks.ok
@@ -0,0 +1,6 @@
+	textline A
+	textline B
+	textline C
+
+Results:
+Mark after delete-undo-redo-undo: [0, 15, 2, 0]