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                                                                                                                                                                                     '''Test idlelib.help_about.

Coverage:
'''
from idlelib import aboutDialog as help_about
from idlelib import textView as textview
from idlelib.idle_test.mock_idle import Func
from idlelib.idle_test.mock_tk import Mbox
import unittest

About = help_about.AboutDialog
class Dummy_about_dialog():
    # Dummy class for testing file display functions.
    idle_credits = About.ShowIDLECredits.im_func
    idle_readme = About.ShowIDLEAbout.im_func
    idle_news = About.ShowIDLENEWS.im_func
    # Called by the above
    display_file_text = About.display_file_text.im_func


class DisplayFileTest(unittest.TestCase):
    "Test that .txt files are found and properly decoded."
    dialog = Dummy_about_dialog()

    @classmethod
    def setUpClass(cls):
        cls.orig_mbox = textview.tkMessageBox
        cls.orig_view = textview.view_text
        cls.mbox = Mbox()
        cls.view = Func()
        textview.tkMessageBox = cls.mbox
        textview.view_text = cls.view
        cls.About = Dummy_about_dialog()

    @classmethod
    def tearDownClass(cls):
        textview.tkMessageBox = cls.orig_mbox
        textview.view_text = cls.orig_view.im_func

    def test_file_isplay(self):
        for handler in (self.dialog.idle_credits,
                        self.dialog.idle_readme,
                        self.dialog.idle_news):
            self.mbox.showerror.message = ''
            self.view.called = False
            handler()
            self.assertEqual(self.mbox.showerror.message, '')
            self.assertEqual(self.view.called, True)


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