[issue11049] add tests for test.support

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Giampaolo,

The patch looks good. Some minor comments below:

* class TestCase(unittest.TestCase): -> why not give the test class a more useful name?
* import_fresh_module is tested similarly to import_module - can't a test be added that it indeed performs its "special sauce"?
* test_DirsOnSysPath: you may want to use assertIn and assertNotIn here. [these were added to Python in 3.1]
* test_python_is_optimized: you may want to use assertIsInstance here.

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