[issue25591] refactor imaplib tests

[Roundup Robot]

Roundup Robot added the comment:

New changeset 75f9cca86fa1 by R David Murray in branch '3.5':
#25591: improve imap tests.
https://hg.python.org/cpython/rev/75f9cca86fa1

New changeset 4663466b0d66 by R David Murray in branch '3.6':
Merge: #25591: improve imap tests.
https://hg.python.org/cpython/rev/4663466b0d66

New changeset 93d8cce449eb by R David Murray in branch 'default':
Merge: #25591: improve imap tests.
https://hg.python.org/cpython/rev/93d8cce449eb

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nosy: +python-dev

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<http://bugs.python.org/issue25591>
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