[issue16997] subtests

[Antoine Pitrou]

Antoine Pitrou added the comment:

New patch attached:
- makes _SubTest a TestCase subclass
- clarifies test skipping for subtests (skipTest() only skips the subtest)
- makes expected failures work as expected by resorting to a thread-local storage hack

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Added file: http://bugs.python.org/file28783/subtests3.patch

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