haypo@smithers$ ./python Lib/test/test_fork1.py 
Traceback (most recent call last):
  File "Lib/test/test_fork1.py", line 111, in <module>
    unittest.main()
NameError: name 'unittest' is not defined

According to pyflakes, the error "undefined name 'unittest'" is found in:

- test_fork1
- test_list
- test_pyclbr
- test_telnetlib
- test_tuple
- test_userdict
- test_userlist
- test_wait4

I put the "easy" flag to give a simple issue to newcomers in Python ;-)

Please check other Python version: 2.7 and 3.5. I'm too lazy to check myself :-D

See issue the issue #25783 which is similar.

Hmm, oops.  This would be a result of 3aec776fc796, which was applied only to the default before 3.5 was branched.

I'd like to fix it!

How am I supposed to start?

I did it!

Can you please take a look at it?

> How am I supposed to start?

Can you please check if the branch 3.5 is impacted?

STINNER Victor added the comment:
> Can you please check if the branch 3.5 is impacted?

It is.

SilentGhost suggested that I should change all occurrences of `TestCase`, on both `test_telnetlib` and `test_pyclbr`, by `unittest.TestCase`. This patch has these changes.

Either patch looks good to me. I don’t have a strong opinion about unittest.TestCase. I left a comment about adding the module=... back in test_pyclbr.

Martin Panter added the comment:
 > I left a comment about adding the module=... back in test_pyclbr.

I had to put it because `test_others` was failing:
(test output)
```
l1=['TestCase']
l2=['unittest.TestCase']
ignore={'object'}
class=<class 'test.test_pyclbr.PyclbrTest'>
FAIL

======================================================================
FAIL: test_others (__main__.PyclbrTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "Lib/test/test_pyclbr.py", line 169, in test_others
    cm('test.test_pyclbr')
  File "Lib/test/test_pyclbr.py", line 102, in checkModule
    self.assertListEq(real_bases, pyclbr_bases, ignore)
  File "Lib/test/test_pyclbr.py", line 27, in assertListEq
    self.fail("%r missing" % missing.pop())
AssertionError: 'unittest.TestCase' missing
```

I'd rather leave things as they were, just add ', main as unittest_main' to the existing 'from unittest import TestCase' and change the call at the end from 'unittest.main()' to 'unittest_main()'.

Felippe, have you signed a contributor agreement?  If not, it can be found here:

   https://www.python.org/psf/contrib/contrib-form/

New changeset a54ee6a65f10 by Zachary Ware in branch '3.5':
Issue #25795: Fix several tests to run independently.
https://hg.python.org/cpython/rev/a54ee6a65f10

New changeset 401459dca320 by Zachary Ware in branch 'default':
Closes #25795: Merge with 3.5
https://hg.python.org/cpython/rev/401459dca320

I made the change to test_pyclbr that I mentioned and committed it.  Thanks, Fellipe!

Thank you!