Test fails on OS X (10.10) with Cocoa Tk 8.6(.4) and 8.5(.18):

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FAIL: test_families (test_tkinter.test_font.FontTest)
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Traceback (most recent call last):
  File "/py/dev/27/root/fwd/Library/Frameworks/pytest_10.10.framework/Versions/2.7/lib/python2.7/lib-tk/test/test_tkinter/test_font.py", line 79, in test_families
    self.assertIn(self.font.actual('family'), families)
AssertionError: '.Helvetica Neue DeskInterface' not found in ('Academy Engraved LET', 'Al Bayan', 'Al Nile', 'Al Tarikh', 'American Typewriter', 'Andale Mono', 'Arial', 'Arial Black', 'Arial Hebrew', 'Arial Hebrew Scholar', 'Arial Narrow', 'Arial Rounded MT Bold', 'Arial Unicode MS', 'Athelas', 'Avenir', 'Avenir Next', 'Avenir Next Condensed', 'Ayuthaya', 'Baghdad', 'Bangla MN', 'Bangla Sangam MN', 'Bank Gothic', 'Baoli SC', 'Baskerville', 'Beirut', 'Big Caslon', 'Blackmoor LET', 'BlairMdITC TT', 'Bodoni 72', 'Bodoni 72 Oldstyle', 'Bodoni 72 Smallcaps', 'Bodoni Ornaments', 'Bordeaux Roman Bold LET', 'Bradley Hand', 'Brush Script MT', 'Capitals', 'Chalkboard', 'Chalkboard SE', 'Chalkduster', 'Charter', 'Cochin', 'Comic Sans MS', 'Copperplate', 'Corsiva Hebrew', 'Courier', 'Courier New', 'Damascus', 'DecoType Naskh', 'Devanagari MT', 'Devanagari Sangam MN', 'Didot', 'DIN Alternate', 'DIN Condensed', 'Diwan Kufi', 'Diwan Thuluth', 'Euphemia UCAS', 'Farah', 'Farisi', 'Futura', 'GB18030 Bitmap', 'Geeza Pro', 'Geneva', 'Georgia', 'Gill Sans', 'Gujarati MT', 'Gujarati Sangam MN', 'GungSeo', 'Gurmukhi MN', 'Gurmukhi MT', 'Gurmukhi Sangam MN', 'Hannotate SC', 'Hannotate TC', 'HanziPen SC', 'HanziPen TC', 'HeadLineA', 'Heiti SC', 'Heiti TC', 'Helvetica', 'Helvetica Neue', 'Herculanum', 'Hiragino Kaku Gothic Pro', [...]