[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2432: consistently use self.mktemp() to create a temporary directory in tests

[Tahoe-LAFS]

#2432: consistently use self.mktemp() to create a temporary directory in tests
---------------------------+------------------------
 Reporter:  daira          |          Owner:  daira
     Type:  defect         |         Status:  new
 Priority:  normal         |      Milestone:  1.11.0
Component:  code           |        Version:  1.10.0
 Keywords:  tests cleanup  |  Launchpad Bug:
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 Currently we use a hotchpotch of methods to create a temporary directory
 for a test -- specifying the name manually, using a `workdir` method,
 using `self.mktemp()` from `twisted.trial.unittest.TestCase`, etc. (It is
 usually consistent within a test module but not across modules.)

 We should just use `self.mktemp()`, or if there is something wrong with
 that then we should consistently use our own mixin.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2432>
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