[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4190: Broken tests: failUnlessRaises has been deprecated

[Tahoe-LAFS]

#4190: Broken tests: failUnlessRaises has been deprecated
---------------------------+---------------------------
 Reporter:  hacklschorsch  |          Owner:
     Type:  defect         |         Status:  new
 Priority:  normal         |      Milestone:  undecided
Component:  unknown        |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
---------------------------+---------------------------
 `failUnlessRaises` has been deprecated in favor of `assertRaises`.

 This breaks tests (see https://app.circleci.com/pipelines/github/tahoe-
 lafs/tahoe-lafs/5377/workflows/cd00a81d-54c3-43be-8041-719ea727c3f1).

 Thanks @sajith for the pointer (both the broken tests and the possible
 cause)!

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4190>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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