import unittest import tkinter from test.support import requires, swap_attr from test.test_tkinter.support import AbstractDefaultRootTest from tkinter.commondialog import Dialog from tkinter.messagebox import showinfo requires('gui') class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase): 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 self.assertRaises(ZeroDivisionError, showinfo, "Spam", "Egg Information") self.assertEqual(ismapped, False) root = tkinter.Tk() ismapped = None self.assertRaises(ZeroDivisionError, showinfo, "Spam", "Egg Information") self.assertEqual(ismapped, True) root.destroy() tkinter.NoDefaultRoot() self.assertRaises(RuntimeError, showinfo, "Spam", "Egg Information") if __name__ == "__main__": unittest.main()