Almost always fails 8/10 times.

cpython git:(master) $ ./python -m unittest -v test.test_pkg
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 "/home/cpython/Lib/test/test_pkg.py", line 180, in test_4
    self.run_code(s)
  File "/home/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/tmpfxqne6o1/t4.py", line 1, in <module>
RuntimeError: Shouldnt load t4.py

======================================================================
FAIL: test_7 (test.test_pkg.TestPkg)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/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 0.040s

FAILED (failures=1, errors=1)