[docs] [issue19950] Document that unittest.TestCase.__init__ is called once per test

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:


New changeset 436972e295f5057fe7cdd7312f543c2fa884705d by Gregory P. Smith (Miss Islington (bot)) in branch '3.7':
bpo-19950: Clarify unittest TestCase instance use. (GH-6875) (GH-6938)
https://github.com/python/cpython/commit/436972e295f5057fe7cdd7312f543c2fa884705d


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