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http://buildbot.python.org/all/builders/AMD64%20Windows10%203.x/builds/203/steps/test/logs/stdio
======================================================================
ERROR: setUpClass (tkinter.test.test_tkinter.test_font.FontTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "D:\buildarea3円.x.bolen-windows10\build\lib\tkinter\test\test_tkinter\test_font.py", line 17, in setUpClass
 cls.font = font.Font(root=cls.root, name=fontname, exists=True)
 File "D:\buildarea3円.x.bolen-windows10\build\lib\tkinter\font.py", line 71, in __init__
 root = tkinter._default_root
AttributeError: module 'tkinter' has no attribute '_default_root'
======================================================================
ERROR: test_use (tkinter.test.test_tkinter.test_widgets.ToplevelTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "D:\buildarea3円.x.bolen-windows10\build\lib\tkinter\test\test_tkinter\test_widgets.py", line 95, in test_use
 widget2 = self.create(use=wid)
 File "D:\buildarea3円.x.bolen-windows10\build\lib\tkinter\test\test_tkinter\test_widgets.py", line 70, in create
 return tkinter.Toplevel(self.root, **kwargs)
 File "D:\buildarea3円.x.bolen-windows10\build\lib\tkinter\__init__.py", line 2181, in __init__
 BaseWidget.__init__(self, master, 'toplevel', cnf, {}, extra)
 File "D:\buildarea3円.x.bolen-windows10\build\lib\tkinter\__init__.py", line 2138, in __init__
 (widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: integer value too large to represent

New changeset d70026504feb by Serhiy Storchaka in branch 'default':
Issue #25263: Trying to fix test_use on Windows.
https://hg.python.org/cpython/rev/d70026504feb 

Didn't help.
http://buildbot.python.org/all/builders/AMD64%20Windows8%203.x/builds/1494/steps/test/logs/stdio
======================================================================
ERROR: test_use (tkinter.test.test_tkinter.test_widgets.ToplevelTest) (wid='0xffffffffbf300038')
----------------------------------------------------------------------
Traceback (most recent call last):
 File "D:\buildarea3円.x.bolen-windows8\build\lib\tkinter\test\test_tkinter\test_widgets.py", line 96, in test_use
 widget2 = self.create(use=wid)
 File "D:\buildarea3円.x.bolen-windows8\build\lib\tkinter\test\test_tkinter\test_widgets.py", line 70, in create
 return tkinter.Toplevel(self.root, **kwargs)
 File "D:\buildarea3円.x.bolen-windows8\build\lib\tkinter\__init__.py", line 2181, in __init__
 BaseWidget.__init__(self, master, 'toplevel', cnf, {}, extra)
 File "D:\buildarea3円.x.bolen-windows8\build\lib\tkinter\__init__.py", line 2138, in __init__
 (widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: integer value too large to represent
----------------------------------------------------------------------

New changeset 3f8998c2fbf9 by Serhiy Storchaka in branch 'default':
Issue #25263: Trying to fix test_use on Windows.
https://hg.python.org/cpython/rev/3f8998c2fbf9 

Looks as there is also Tk bug. Perhaps on Windows (and Unix?) "winfo id" can return 64-bit integer, but the -use option works only with 32-bit integers.
Opened Tk ticket: http://core.tcl.tk/tk/tktview?name=5ee8af61e5 .

The other failure is not Windows specific. It can be reproduced if run test_tk twice. FontTest.setUpClass() incorrectly call parent's method and the root attribute is set in parent class. tearDownClass() sets the root attribute to None in child class, and this overrides parent's attribute. The test in the second run passes self.root (is None) to font.Font constructor, and this is interpreted as no the root argument passed.

New changeset 385b3aaf8401 by Serhiy Storchaka in branch '3.4':
Issue #25263: Fixed the tkinter.test.test_tkinter.test_font.FontTest test
https://hg.python.org/cpython/rev/385b3aaf8401
New changeset db168611c6c8 by Serhiy Storchaka in branch '3.5':
Issue #25263: Fixed the tkinter.test.test_tkinter.test_font.FontTest test
https://hg.python.org/cpython/rev/db168611c6c8
New changeset 0632642c30dd by Serhiy Storchaka in branch 'default':
Issue #25263: Fixed the tkinter.test.test_tkinter.test_font.FontTest test
https://hg.python.org/cpython/rev/0632642c30dd
New changeset f81e357b2318 by Serhiy Storchaka in branch '2.7':
Issue #25263: Fixed the tkinter.test.test_tkinter.test_font.FontTest test
https://hg.python.org/cpython/rev/f81e357b2318 

Tk bug looks fixed in next releases of Tk 8.5 and 8.6. Here is a patch that adds a workaround for the test.

Tests are fixed.