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BERHASIL DIUBAH!

EDITING: test_messagebox.py

import unittest
import tkinter
from test.support import requires, swap_attr
from tkinter.test.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()