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

[Michael Foord]

Michael Foord added the comment:

I'd be happy with a doc change from "fixture" to instance (or maybe add instance in parentheses). I'd rather a simple change than making the documentation much longer.

The reason for a separate instance per test is for test isolation. Each test can create and modify instance attributes without them affecting other tests from the same class.

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<http://bugs.python.org/issue19950>
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