[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2777: modernize tests, use "mock"

[Tahoe-LAFS]

#2777: modernize tests, use "mock"
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     Reporter:  warner  |      Owner:
         Type:  task    |     Status:  new
     Priority:  minor   |  Milestone:  undecided
    Component:  code    |    Version:  1.11.0
   Resolution:          |   Keywords:
Launchpad Bug:          |
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Comment (by warner):

 #2465 is where we removed "mock" about 8 months ago (mostly because it
 wanted a modern setuptools, but we had zetuptoolz, a reason that has gone
 away).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2777#comment:1>
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