New submission from Cheryl Sabella:

Running the tests over up to date build on Ubuntu 16.04 64-bit.

./python -m test.test_ttk_guionly -v


Sometimes this runs without failure and sometimes it 'hangs' and then produces 
failures.  When it hangs, my computer freezes completely.  As you can see, it 
can run for 8 minutes.

It seems to hang most often on test_idenify in EntryTest.

Here's one set of failures:

======================================================================
FAIL: test_identify (tkinter.test.test_ttk.test_widgets.EntryTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
332, in test_identify
    self.assertEqual(self.entry.identify(5, 5), "textarea")
AssertionError: '' != 'textarea'
+ textarea

======================================================================
FAIL: test_get (tkinter.test.test_ttk.test_widgets.ScaleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
807, in test_get
    self.assertEqual(self.scale.get(scale_width, 0), self.scale['to'])
AssertionError: 0.0 != 1.0

======================================================================
FAIL: test_set (tkinter.test.test_ttk.test_widgets.ScaleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
849, in test_set
    self.assertEqual(conv(self.scale.get(self.scale.winfo_width(), 0)), max)
AssertionError: 0.0 != 1.0

======================================================================
FAIL: test_identify (tkinter.test.test_ttk.test_widgets.WidgetTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
71, in test_identify
    ), "label")
AssertionError: '' != 'label'
+ label

----------------------------------------------------------------------
Ran 272 tests in 491.572s

FAILED (failures=4)



Here's another set from a different run:

======================================================================
FAIL: test_get (tkinter.test.test_ttk.test_widgets.ScaleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
807, in test_get
    self.assertEqual(self.scale.get(scale_width, 0), self.scale['to'])
AssertionError: 0.0 != 1.0

======================================================================
FAIL: test_set (tkinter.test.test_ttk.test_widgets.ScaleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
849, in test_set
    self.assertEqual(conv(self.scale.get(self.scale.winfo_width(), 0)), max)
AssertionError: 0.0 != 1.0

======================================================================
FAIL: test_identify (tkinter.test.test_ttk.test_widgets.WidgetTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_widgets.py", line 
71, in test_identify
    ), "label")
AssertionError: '' != 'label'
+ label

======================================================================
FAIL: test_horizontal_range 
(tkinter.test.test_ttk.test_extensions.LabeledScaleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/cheryl/cpython/Lib/tkinter/test/test_ttk/test_extensions.py", 
line 122, in test_horizontal_range
    self.assertEqual(prev_xcoord, int(linfo_1['x']))
AssertionError: 16 != 1

----------------------------------------------------------------------
Ran 272 tests in 353.180s

FAILED (failures=4)

----------
components: Tests
messages: 296835
nosy: csabella, serhiy.storchaka, terry.reedy
priority: normal
severity: normal
status: open
title: GUI tests fail on Ubuntu
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30756>
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