diff --git a/src/testdir/test_marks.vim b/src/testdir/test_marks.vim
new file mode 100644
index 0000000..d00b1dd
--- /dev/null
+++ b/src/testdir/test_marks.vim
@@ -0,0 +1,26 @@
+
+" Test that a deleted mark is restored after delete-undo-redo-undo.
+function! Test_Restore_DelMark()
+  enew!
+  call append(0, ["	textline A", "	textline B", "	textline C"])
+  normal! 2gg
+  set nocp viminfo+=nviminfo
+  exe "normal! i\<C-G>u\<Esc>"
+  exe "normal! maddu\<C-R>u"
+  let pos = getpos("'a")
+  call assert_equal(2, pos[1])
+  call assert_equal(1, pos[2])
+  enew!
+endfunction
+
+" Test that CTRL-A and CTRL-X updates last changed mark '[, '].
+function! Test_Incr_Marks()
+  enew!
+  call append(0, ["123 123 123", "123 123 123", "123 123 123"])
+  normal! gg
+  execute "normal! \<C-A>`[v`]rAjwvjw\<C-X>`[v`]rX"
+  call assert_equal("AAA 123 123", getline(1))
+  call assert_equal("123 XXXXXXX", getline(2))
+  call assert_equal("XXX 123 123", getline(3))
+  enew!
+endfunction