Edit

[EDIT] FILE: test_config_name.py

"""Unit tests for idlelib.configSectionNameDialog"""
import unittest
from idlelib.idle_test.mock_tk import Var, Mbox
from idlelib import configSectionNameDialog as name_dialog_module

name_dialog = name_dialog_module.GetCfgSectionNameDialog

class Dummy_name_dialog(object):
    # Mock for testing the following methods of name_dialog
    name_ok = name_dialog.name_ok.im_func
    Ok = name_dialog.Ok.im_func
    Cancel = name_dialog.Cancel.im_func
    # Attributes, constant or variable, needed for tests
    used_names = ['used']
    name = Var()
    result = None
    destroyed = False
    def grab_release(self):
        pass
    def destroy(self):
        self.destroyed = True

# name_ok calls Mbox.showerror if name is not ok
orig_mbox = name_dialog_module.tkMessageBox
showerror = Mbox.showerror

class ConfigNameTest(unittest.TestCase):
    dialog = Dummy_name_dialog()

@classmethod
    def setUpClass(cls):
        name_dialog_module.tkMessageBox = Mbox

@classmethod
    def tearDownClass(cls):
        name_dialog_module.tkMessageBox = orig_mbox

def test_blank_name(self):
        self.dialog.name.set(' ')
        self.assertEqual(self.dialog.name_ok(), '')
        self.assertEqual(showerror.title, 'Name Error')
        self.assertIn('No', showerror.message)

def test_used_name(self):
        self.dialog.name.set('used')
        self.assertEqual(self.dialog.name_ok(), '')
        self.assertEqual(showerror.title, 'Name Error')
        self.assertIn('use', showerror.message)

def test_long_name(self):
        self.dialog.name.set('good'*8)
        self.assertEqual(self.dialog.name_ok(), '')
        self.assertEqual(showerror.title, 'Name Error')
        self.assertIn('too long', showerror.message)

def test_good_name(self):
        self.dialog.name.set('  good ')
        showerror.title = 'No Error'  # should not be called
        self.assertEqual(self.dialog.name_ok(), 'good')
        self.assertEqual(showerror.title, 'No Error')

def test_ok(self):
        self.dialog.destroyed = False
        self.dialog.name.set('good')
        self.dialog.Ok()
        self.assertEqual(self.dialog.result, 'good')
        self.assertTrue(self.dialog.destroyed)

def test_cancel(self):
        self.dialog.destroyed = False
        self.dialog.Cancel()
        self.assertEqual(self.dialog.result, '')
        self.assertTrue(self.dialog.destroyed)

if __name__ == '__main__':
    unittest.main(verbosity=2, exit=False)

CANCEL