test/: PEP8 compliancy (#24803)

* test/: PEP8 compliancy

- Make PEP8 compliant

* Python3 chokes on casting int to bytes (#24952)

But if we tell the formatter that the var is a number, it works

test/units/utils/test_shlex.py

@@ -36,4 +36,3 @@ class TestSplit(unittest.TestCase):
 
     def test_error(self):
         self.assertRaises(ValueError, shlex_split, 'a "b')
-