[issue22111] Improve imaplib testsuite.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6b2cafab7a9f by Antoine Pitrou in branch 'default':
Issue #22111: Assorted cleanups in test_imaplib.  Patch by Milan Oberkirch.
http://hg.python.org/cpython/rev/6b2cafab7a9f

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nosy: +python-dev

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<http://bugs.python.org/issue22111>
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