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On 3.6.0a2, 3.5.2rc1, and 2.7.12rc1:
======================================================================
FAIL: test_identify (tkinter.test.test_ttk.test_widgets.ComboboxTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/tkinter/test/test_ttk/test_widgets.py", line 332, in test_identify
 self.assertEqual(self.entry.identify(5, 5), "textarea")
AssertionError: 'Combobox.button' != 'textarea'
- Combobox.button
+ textarea
On 3.6.0a2 and 3.5.2rc1:
======================================================================
FAIL: test_virtual_event (tkinter.test.test_ttk.test_widgets.ComboboxTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/tkinter/test/test_ttk/test_widgets.py", line 455, in test_virtual_event
 self.assertTrue(success)
AssertionError: [] is not true
----------------------------------------------------------------------

These tests are not new. Are failures stable? What version of Tk is used?

Ah, sorry, I missed the version in the title.

For example, the tests pass in 3.5.1 but fail in 3.5.2rc1. I see that the changesets associated with Issue26177 altered them.

Are there failures if run tests separately?
$ ./python -m test -vu gui -m test_identify test_ttk_guionly
If no, could you please find a test running before test_identify or test_virtual_event that provokes a failure?
I can't reproduce failures on Linux. Needed help of Mac user for investigating this issue.

test_ttk_guionly runs test_identify, doesn't it? (I'll try to take a look at it later when I have more time.)
$ /usr/local/bin/python3.5 -m test -vu gui test_ttk_guionly
== CPython 3.5.2rc1 (v3.5.2rc1:68feec6488b2, Jun 11 2016, 21:59:53) [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]
== Darwin-15.5.0-x86_64-i386-64bit little-endian
== hash algorithm: siphash24 64bit
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0)
[1/1] test_ttk_guionly
test_horizontal_range (tkinter.test.test_ttk.test_extensions.LabeledScaleTest) ... ok
test_initialization (tkinter.test.test_ttk.test_extensions.LabeledScaleTest) ... ok
test_initialization_no_master (tkinter.test.test_ttk.test_extensions.LabeledScaleTest) ... ok
test_resize (tkinter.test.test_ttk.test_extensions.LabeledScaleTest) ... ok
test_variable_change (tkinter.test.test_ttk.test_extensions.LabeledScaleTest) ... ok
test_widget_destroy (tkinter.test.test_ttk.test_extensions.LabeledScaleTest) ... ok
test_initialization (tkinter.test.test_ttk.test_extensions.OptionMenuTest) ... ok
test_menu (tkinter.test.test_ttk.test_extensions.OptionMenuTest) ... ok
test_widget_destroy (tkinter.test.test_ttk.test_extensions.OptionMenuTest) ... ok
test_configure (tkinter.test.test_ttk.test_style.StyleTest) ... ok
test_layout (tkinter.test.test_ttk.test_style.StyleTest) ... ok
test_lookup (tkinter.test.test_ttk.test_style.StyleTest) ... ok
test_map (tkinter.test.test_ttk.test_style.StyleTest) ... ok
test_theme_use (tkinter.test.test_ttk.test_style.StyleTest) ... ok
patchlevel = 8.5.18
[...]
test_foreground (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_height (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_identify (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... FAIL
test_invalidcommand (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_justify (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_keys (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_postcommand (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
[...]
test_validatecommand (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_validation (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_validation_options (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_values (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_virtual_event (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... FAIL
test_width (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_xscrollcommand (tkinter.test.test_ttk.test_widgets.ComboboxTest) ... ok
test_background (tkinter.test.test_ttk.test_widgets.EntryTest) ... ok
[...]
test_identify (tkinter.test.test_ttk.test_widgets.WidgetTest) ... ok
test_widget_state (tkinter.test.test_ttk.test_widgets.WidgetTest) ... ok
======================================================================
FAIL: test_identify (tkinter.test.test_ttk.test_widgets.ComboboxTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/tkinter/test/test_ttk/test_widgets.py", line 332, in test_identify
 self.assertEqual(self.entry.identify(5, 5), "textarea")
AssertionError: 'Combobox.button' != 'textarea'
- Combobox.button
+ textarea
======================================================================
FAIL: test_virtual_event (tkinter.test.test_ttk.test_widgets.ComboboxTest)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/tkinter/test/test_ttk/test_widgets.py", line 455, in test_virtual_event
 self.assertTrue(success)
AssertionError: [] is not true
----------------------------------------------------------------------
Ran 271 tests in 3.242s
FAILED (failures=2, skipped=11)
test test_ttk_guionly failed
1 test failed:
 test_ttk_guionly

With a current Tk 8.6.8, test_virtual_event no longer fails (still does with 8.5.18) but test_identify still fails as it does with 8.5.

New changeset aeca373b339e0ea9739536ce6b43bd90f3b89873 by Ned Deily in branch 'master':
bpo-27313: Avoid test_ttk_guionly ComboboxTest fail with macOS Cocoa Tk (GH-12011)
https://github.com/python/cpython/commit/aeca373b339e0ea9739536ce6b43bd90f3b89873

New changeset 25d20a6503f3cd4ff8cf0e8ee33eea2b1daa77a8 by Miss Islington (bot) in branch '3.7':
bpo-27313: Avoid test_ttk_guionly ComboboxTest fail with macOS Cocoa Tk (GH-12011)
https://github.com/python/cpython/commit/25d20a6503f3cd4ff8cf0e8ee33eea2b1daa77a8

New changeset 1dee4565fae9ccb54719fa99d7944c148736083a by Ned Deily (Miss Islington (bot)) in branch '3.6':
bpo-27313: Avoid test_ttk_guionly ComboboxTest fail with macOS Cocoa Tk (GH-12011) (GH-12013)
https://github.com/python/cpython/commit/1dee4565fae9ccb54719fa99d7944c148736083a

New changeset b5213f4def07107952ce422ecc9d8508f4f084b4 by Ned Deily in branch '2.7':
[2.7] bpo-27313: Avoid test_ttk_guionly ComboboxTest fail with macOS Cocoa Tk (GH-12015)
https://github.com/python/cpython/commit/b5213f4def07107952ce422ecc9d8508f4f084b4

macOS Cocoa Tk returns an identity of 'Combobox.button' for the created Combobox widget at the tested location whereas the X-based Tk's (including the macOS X version) returns 'textarea'. Rather than try to further modify the test code, I just modified the test case to pass with either value when running on macOS.

New changeset e52f9bee802aa7a7fbd405dcc43bc2d1bea884d9 by Łukasz Langa in branch 'main':
bpo-27313: Fix ttk_guionly tests failing on Framework builds on macOS (GH-29411)
https://github.com/python/cpython/commit/e52f9bee802aa7a7fbd405dcc43bc2d1bea884d9

New changeset 363ecb36da273ddb0c80ad14f3f1aa5101223bc2 by Miss Islington (bot) in branch '3.10':
bpo-27313: Fix ttk_guionly tests failing on Framework builds on macOS (GH-29411) (GH-29422)
https://github.com/python/cpython/commit/363ecb36da273ddb0c80ad14f3f1aa5101223bc2

New changeset 885e57c148d0b2c34daa2b7e5162dc57cf7e4469 by Miss Islington (bot) in branch '3.9':
bpo-27313: Fix ttk_guionly tests failing on Framework builds on macOS (GH-29411) (GH-29423)
https://github.com/python/cpython/commit/885e57c148d0b2c34daa2b7e5162dc57cf7e4469

New changeset cc1cbcbb2d75cacc31ff3359d83043bc7bd5a89d by Serhiy Storchaka in branch 'main':
bpo-27313: Use non-deprecated methods for tracing (GH-29425)
https://github.com/python/cpython/commit/cc1cbcbb2d75cacc31ff3359d83043bc7bd5a89d

New changeset 8fdf6c64d3e0183c21f069d31d350a907ce42708 by Miss Islington (bot) in branch '3.10':
bpo-27313: Use non-deprecated methods for tracing (GH-29425) (GH-29450)
https://github.com/python/cpython/commit/8fdf6c64d3e0183c21f069d31d350a907ce42708

New changeset 376218e1c65c029c24e45ca408a14f681cf1aeae by Miss Islington (bot) in branch '3.9':
bpo-27313: Use non-deprecated methods for tracing (GH-29425) (GH-29451)
https://github.com/python/cpython/commit/376218e1c65c029c24e45ca408a14f681cf1aeae