diff -r 373ec8711ad0 Lib/idlelib/configHelpSourceEdit.py
--- a/Lib/idlelib/configHelpSourceEdit.py	Tue Feb 11 10:30:59 2014 +0200
+++ b/Lib/idlelib/configHelpSourceEdit.py	Sun Feb 16 13:14:47 2014 -0500
@@ -159,11 +159,16 @@
         self.destroy()

 if __name__ == '__main__':
-    #test the dialog
+    import unittest
+    unittest.main(
+        'idlelib.idle_test.test_config_helpsource', verbosity=2, exit=False)
+
+    # test the dialog
     root = Tk()
     def run():
         keySeq = ''
         dlg = GetHelpSourceDialog(root, 'Get Help Source')
         print(dlg.result)
-    Button(root,text='Dialog', command=run).pack()
+    Button(root, text='Dialog', command=run).pack()
     root.mainloop()
+
diff -r 373ec8711ad0 Lib/idlelib/idle_test/mock_tk.py
--- a/Lib/idlelib/idle_test/mock_tk.py	Tue Feb 11 10:30:59 2014 +0200
+++ b/Lib/idlelib/idle_test/mock_tk.py	Sun Feb 16 13:14:47 2014 -0500
@@ -1,8 +1,11 @@
 """Classes that replace tkinter gui objects used by an object being tested.

-A gui object is anything with a master or parent paramenter, which is typically
-required in spite of what the doc strings say.
+A gui object is anything with a master or parent paramenter, which is
+typically required in spite of what the doc strings say.  These classes
+are typically used in dummy classes that allow tests of non-gui
+functions and methods to run without a gui available.
 """
+from _tkinter import TclError

 class Var:
     "Use for String/Int/BooleanVar: incomplete"
@@ -66,7 +69,10 @@
     showinfo = Mbox_func()     # None
     showwarning = Mbox_func()  # None

-from _tkinter import TclError
+class Entry:
+    "Minimal mock for tkinter.Entry; expand as needed."
+    def focus_set(self):
+        pass

 class Text:
     """A semi-functional non-gui replacement for tkinter.Text text editors.
diff -r 373ec8711ad0 Lib/idlelib/idle_test/test_config_helpsource.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/idlelib/idle_test/test_config_helpsource.py	Sun Feb 16 13:14:47 2014 -0500
@@ -0,0 +1,103 @@
+"""Unit test for idlelib.configHelpSourceEdit"""
+import unittest
+from idlelib.idle_test.mock_tk import Var, Mbox, Entry
+from idlelib import configHelpSourceEdit as helpsource_dialog_module
+
+helpsource_dialog = helpsource_dialog_module.GetHelpSourceDialog
+
+class dummy_helpsource_dialog:
+    # Mock for testing the following methods
+    MenuOk = helpsource_dialog.MenuOk
+    PathOk = helpsource_dialog.PathOk
+    Cancel = helpsource_dialog.Cancel
+    Ok = helpsource_dialog.Ok
+    # Attributes required by MenuOk and PathOk
+    entryMenu = Entry()
+    entryPath = Entry()
+    # Attributes, constant or variable required for tests.
+    menu = Var()
+    path = Var()
+    result = None
+    destroyed = False
+
+    def destroy(self):
+        self.destroyed = True
+
+# menu_ok calls Mbox.showerror if menu is not ok
+orig_mbox = helpsource_dialog_module.tkMessageBox
+showerror = Mbox.showerror
+
+
+class ConfigHelpSourceDialog(unittest.TestCase):
+    dialog = dummy_helpsource_dialog()
+
+    @classmethod
+    def setUpClass(cls):
+        helpsource_dialog_module.tkMessageBox = Mbox
+
+    @classmethod
+    def tearDownClass(cls):
+        helpsource_dialog_module.tkMessageBox = orig_mbox
+
+    def test_blank_menu(self):
+        self.dialog.menu.set('')
+        self.assertEqual(self.dialog.MenuOk(), False)
+        self.assertEqual(showerror.title, 'Menu Item Error')
+        self.assertIn('No', showerror.message)
+
+    def test_long_menu(self):
+        self.dialog.menu.set('foobar' * 8)
+        self.assertEqual(self.dialog.MenuOk(), False)
+        self.assertEqual(showerror.title, 'Menu Item Error')
+        self.assertIn('too long', showerror.message)
+
+    def test_good_menu(self):
+        self.dialog.menu.set('  this name is good')
+        self.assertEqual(self.dialog.MenuOk(), True)
+
+    def test_blank_path(self):
+        self.dialog.path.set('')
+        self.assertEqual(self.dialog.PathOk(), False)
+        self.assertEqual(showerror.title, 'File Path Error')
+        self.assertIn('No', showerror.message)
+
+    def test_invalid_paths(self):
+        # Test for invalid url path
+        self.dialog.path.set('ww.python.org')
+        self.assertEqual(self.dialog.PathOk(), False)
+        self.assertEqual(showerror.title, 'File Path Error')
+        self.assertIn('not', showerror.message)
+
+        # Test for invalid file path
+        self.dialog.path.set('testfile' * 8)
+        self.assertEqual(self.dialog.PathOk(), False)
+        self.assertEqual(showerror.title, 'File Path Error')
+        self.assertIn('not', showerror.message)
+
+    def test_good_path(self):
+        # Test for valid url path
+        self.dialog.path.set('www.python.org')
+        self.assertEqual(self.dialog.PathOk(), True)
+
+        # Test for valid file path
+        self.dialog.path.set('/')
+        self.assertEqual(self.dialog.PathOk(), True)
+
+    def test_ok(self):
+        self.dialog.destroyed = False
+        self.dialog.menu.set('good')
+        self.dialog.path.set('www.python.org')
+        self.dialog.Ok()
+        self.assertEqual(self.dialog.result, ('good', 'www.python.org'))
+        self.assertTrue(self.dialog.destroyed)
+
+    def test_cancel(self):
+        self.dialog.destroyed = False
+        self.dialog.menu.set('good')
+        self.dialog.path.set('www.python.org')
+        self.dialog.Cancel()
+        self.assertEqual(self.dialog.result, None)
+        self.assertTrue(self.dialog.destroyed)
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2, exit=False)