[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2988: Many test mixins fail to supercall implementations of hook methods

[Tahoe-LAFS]

#2988: Many test mixins fail to supercall implementations of hook methods
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  1.12.1
 Keywords:           |  Launchpad Bug:
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 For example, `GridTestMixin.setUp` does not supercall.  This means you get
 a kind of random outcome if you happen to mix this in and override
 `setUp`.

 Ultimately all these mixins should be eliminated.  They're a complicated
 and therefore error-prone way to share functionality.  But in the short
 term, fix them to at least do the correct supercalls.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2988>
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