[issue17464] Improve Test Coverage Of Pydoc

[R. David Murray]

R. David Murray added the comment:

Thanks for the patch.

Rather than create and destroy a directory for every test (setUp/tearDown), it is possible to use the test.support.temp_cwd context manager to create and destroy one inside the single tests that need it.

A nit: we prefer to keep the line length to <80 (that is, max 79).

In test_getting_all_methods_from_class, why is 'method_returning_true' not in the list?  I also worry that this test is a bit fragile, but I don't have a good suggestion for how to fix that, so we'll probably just have to live with it.

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nosy: +r.david.murray

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