[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
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     Reporter:  daira   |      Owner:  daira
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  1.13.0
    Component:  code    |    Version:  1.10.0
   Resolution:          |   Keywords:  tests cleanup
Launchpad Bug:          |
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Comment (by exarkun):

 Probably switch to testtools and use the TempDir fixture.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2432#comment:7>
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