[issue9412] test_smtpd leaks references

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> That's odd. I didn't run the refcount tests because I was only adding
> Python code.

That's not odd. A reference leak can indicate that some objects hang in
memory permanently rather than being cleaned up after the test run.
Looking at the code you added, DummyServer.messages will slowly
accumulate more and more Python objects as the tests get run several
times.
(it's not necessarily the only cause of the refleak, though)

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<http://bugs.python.org/issue9412>
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