Putting functions (rather than TestCase instances) directly in TestSuites was never officially supported but it used to work:
>>> from unittest import TestSuite, TestResult
>>> def f(): pass
...
>>> s = TestSuite()
>>> s.addTest(f)
>>> s.run(TestResult())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/compile/python-trunk/Lib/unittest/suite.py", line 85, in run
self._wrapped_run(result)
File "/compile/python-trunk/Lib/unittest/suite.py", line 100, in _wrapped_run
self._handleClassSetUp(test, result)
File "/compile/python-trunk/Lib/unittest/suite.py", line 122, in _handleClassSetUp
currentClass._classSetupFailed = False
TypeError: can't set attributes of built-in/extension type 'function'
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