Method test_callback

Lib/test/test_tkinter/test_messagebox.py:15–19

(dialog, master)

    def test_showinfo(self):
        def test_callback(dialog, master):
            nonlocal ismapped
            master.update()
            ismapped = master.winfo_ismapped()
            raise ZeroDivisionError

        with swap_attr(Dialog, '_test_callback', test_callback):
            ismapped = None