Method test_after_cancel

Lib/test/test_tkinter/test_misc.py:219–258

(self)

        self.assertEqual(count, 54)

    def test_after_cancel(self):
        root = self.root

        def callback():
            nonlocal count
            count += 1

        timer1 = root.after(5000, callback)
        idle1 = root.after_idle(callback)

        # No value for id raises a ValueError.
        with self.assertRaises(ValueError):
            root.after_cancel(None)

        # Cancel timer event.
        count = 0
        (script, _) = root.tk.splitlist(root.tk.call('after', 'info', timer1))
        root.tk.call(script)
        self.assertEqual(count, 1)
        root.after_cancel(timer1)
        with self.assertRaises(tkinter.TclError):
            root.tk.call(script)
        self.assertEqual(count, 1)
        with self.assertRaises(tkinter.TclError):
            root.tk.call('after', 'info', timer1)

        # Cancel same event - nothing happens.
        root.after_cancel(timer1)

        # Cancel idle event.
        count = 0
        (script, _) = root.tk.splitlist(root.tk.call('after', 'info', idle1))
        root.tk.call(script)
        self.assertEqual(count, 1)
        root.after_cancel(idle1)
        with self.assertRaises(tkinter.TclError):
            root.tk.call(script)
        self.assertEqual(count, 1)
        with self.assertRaises(tkinter.TclError):
            root.tk.call('after', 'info', idle1)

    def test_after_info(self):
        root = self.root