[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2777: modernize tests

[Tahoe-LAFS]

#2777: modernize tests
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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 exarkun):

 Also relevant
  * https://pythonspeed.com/articles/verified-fakes/
  * https://martinfowler.com/articles/mocksArentStubs.html

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2777#comment:11>
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