diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 8a58926..c1bae36 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -1282,12 +1282,20 @@
   " put the title on.
   let lines =<< trim END
 	call setline(1, range(1, 20))
-	call popup_create(['one', 'two', 'another'], #{title: 'Title String'})
+	let winid = popup_create(['one', 'two', 'another'], #{title: 'Title String'})
   END
   call writefile(lines, 'XtestPopupTitle')
   let buf = RunVimInTerminal('-S XtestPopupTitle', #{rows: 10})
   call VerifyScreenDump(buf, 'Test_popupwin_title', {})
 
+  call term_sendkeys(buf, ":call popup_setoptions(winid, #{maxwidth: 20, title: 'a very long title that is not going to fit'})\<CR>")
+  call term_sendkeys(buf, ":\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_longtitle_1', {})
+
+  call term_sendkeys(buf, ":call popup_setoptions(winid, #{border: []})\<CR>")
+  call term_sendkeys(buf, ":\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_longtitle_2', {})
+
   " clean up
   call StopVimInTerminal(buf)
   call delete('XtestPopupTitle')