[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2297: improve precision of coverage reports by including coverage by subprocesses

[Tahoe-LAFS]

#2297: improve precision of coverage reports by including coverage by subprocesses
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     Reporter:  daira   |      Owner:
         Type:  defect  |     Status:  new
     Priority:  normal  |  Milestone:  undecided
    Component:  code    |    Version:  1.10.0
   Resolution:          |   Keywords:  coverage subprocess
Launchpad Bug:          |
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Comment (by daira):

 I don't see how we can abolish subprocesses. We do perform as many of the
 runner tests as possible using `deferToThread`, but that doesn't fully
 test how nodes are actually run (indeed we've had several bugs that only
 showed up in the subprocess tests, because they are more realistic).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2297#comment:3>
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