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diff --git a/lib/python2.7/idlelib/idle_test/test_helpabout.py b/lib/python2.7/idlelib/idle_test/test_helpabout.py
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+++ b/lib/python2.7/idlelib/idle_test/test_helpabout.py
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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)