New submission from Danylo <diz...@gmail.com>:

Currently, unittest setUpClass and tearDownClass methods are incorrectly called 
from within its core.

```
class TestUltrasonicEnv(unittest.TestCase):

    def setUpClass(cls):
        pass
    

    def tearDownClass(cls):
        pass
```

Traceback (the same for teadDownClass)
```
  File "/home/dizcza/anaconda3/envs/robotsim/lib/python3.7/unittest/suite.py", 
line 163, in _handleClassSetUp
    setUpClass()
TypeError: setUpClass() missing 1 required positional argument: 'cls'
```

The traceback is self-descriptive.

----------
components: Tests
messages: 354501
nosy: dizcza
priority: normal
severity: normal
status: open
title: unittest setUpClass missing 1 required positional argument: 'cls'
versions: Python 3.7

_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38452>
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