[docs] [issue11298] unittest discovery needs better explanation

[blokeley]

blokeley <blokeley at gmail.com> added the comment:

Is this wording correct?

"""
In order to be compatible with test discovery, all of the test modules must be importable from the top level directory of the project (in other words, they must be part of the project :ref:`package <tut-packages>` or directly importable :ref:`modules <tut-modules>`, and their names must be valid :ref:`identifiers <identifiers>`).
"""

If this wording is acceptable, I can provide patches.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11298>
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