New submission from Martin Panter:

It doesn’t always fail, and sometimes only one or the other test fails. Also, 
it seems to depend on the way the tests are run. I have never seen it fail with 
“python -m test -v”. Two commands where it does often fail for me:

./python -m test -w test_pkg
./python -m unittest -v test.test_pkg

Here is the output when both tests fail:

test_1 (test.test_pkg.TestPkg) ... ok
test_2 (test.test_pkg.TestPkg) ... ok
test_3 (test.test_pkg.TestPkg) ... ok
test_4 (test.test_pkg.TestPkg) ... ERROR
test_5 (test.test_pkg.TestPkg) ... ok
test_6 (test.test_pkg.TestPkg) ... ok
test_7 (test.test_pkg.TestPkg) ... FAIL
test_8 (test.test_pkg.TestPkg) ... ok

======================================================================
ERROR: test_4 (test.test_pkg.TestPkg)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/media/disk/home/proj/python/cpython/Lib/test/test_pkg.py", line 180, 
in test_4
    self.run_code(s)
  File "/media/disk/home/proj/python/cpython/Lib/test/test_pkg.py", line 69, in 
run_code
    exec(textwrap.dedent(code), globals(), {"self": self})
  File "<string>", line 2, in <module>
  File "/tmp/tmprhpx80bw/t4.py", line 1, in <module>
RuntimeError: Shouldnt load t4.py

======================================================================
FAIL: test_7 (test.test_pkg.TestPkg)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/media/disk/home/proj/python/cpython/Lib/test/test_pkg.py", line 260, 
in test_7
    '__name__', '__package__', '__path__', '__spec__'])
AssertionError: Lists differ: ['__c[34 chars]__loader__', '__name__', 
'__package__', '__spec__'] != ['__c[34 chars]__loader__', '__name__', 
'__package__', '__path__', '__spec__']

First differing element 6:
__spec__
__path__

Second list contains 1 additional elements.
First extra element 7:
__spec__

  ['__cached__',
   '__doc__',
   '__file__',
   '__loader__',
   '__name__',
   '__package__',
+  '__path__',
   '__spec__']

----------------------------------------------------------------------
Ran 8 tests in 0.038s

FAILED (failures=1, errors=1)

----------
components: Tests
messages: 258500
nosy: martin.panter
priority: normal
severity: normal
status: open
title: test_pkg test_4 and/or test_7 sometimes fail
type: behavior
versions: Python 3.5, Python 3.6

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26144>
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