test_click_help_source fails on OS X:

======================================================================
FAIL: test_click_help_source (idlelib.idle_test.test_query.HelpsourceGuiTest)
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Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/idlelib/idle_test/test_query.py", line 389, in test_click_help_source
    Equal(dialog.result, ('__test__', __file__))
AssertionError: Tuples differ: ('__test__', 'file:///Library/Frameworks/Python.framewo[58 chars].py') != ('__test__', '/Library/Frameworks/Python.framework/Vers[51 chars].py')

First differing element 1:
'file:///Library/Frameworks/Python.framewo[57 chars]y.py'
'/Library/Frameworks/Python.framework/Vers[50 chars]y.py'

  ('__test__',
-  'file:///Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/idlelib/idle_test/test_query.py')
?   -------

+  '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/idlelib/idle_test/test_query.py')