[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:  1.11.0
    Component:  code    |    Version:  1.10.0
   Resolution:          |   Keywords:  tests cleanup
Launchpad Bug:          |
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Comment (by daira):

 The one thing I don't like about `mktemp()` is that the path it generates
 is not deterministic, due to its use of `mkdtemp`
 ([https://twistedmatrix.com/trac/browser/tags/releases/twisted-15.2.0/twisted/trial/_synctest.py#L1221
 implementation in Twisted v15.2.0]). What I actually want is
 `os.path.dirname(os.path.dirname(self.mktemp())`, I think. So, maybe it
 would be better to have a mixin to shorten that, and so that if we want to
 change it, we can do so in only one place.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2432#comment:3>
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