[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2914: test_magic_folder timeout on windows

[Tahoe-LAFS]

#2914: test_magic_folder timeout on windows
--------------------+------------------------
 Reporter:  warner  |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:  1.13.0
Component:  code    |        Version:  1.12.1
 Keywords:          |  Launchpad Bug:
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 Our Appveyor CI system shows
 `test_magic_folder.RealTest.test_batched_process` hitting a timeout error
 ("test still running after 120 seconds") on windows, on maybe one out of
 every 5 builds.

 I've reconfigured `.appveyor.yml` to include the trial test.log as an
 artifact, so we can see if it's throwing an error, or if it's just taking
 too long and sometimes exceeds the limit. Then we can either be lazy and
 increase the timeout, or actually make it run faster, or if it's an
 intermittent deadlock then fix it for real.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2914>
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