[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3918: Refactor MutableChecker tests

[Tahoe-LAFS]

#3918: Refactor MutableChecker tests
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     Reporter:  fenn-cs  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  undecided
    Component:  unknown  |    Version:  n/a
   Resolution:           |   Keywords:
Launchpad Bug:           |
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Description changed by fenn-cs:

Old description:

> Update `MutableChecker` tests in src/allmydata/test/test_storage.py to
> either use `SyncTestCase` or `AsyncTestCas`e base test case and not
> unittest.TestCase
>
> This refactor would also involve using new and better assertion methods.
>
> Just like in [3917](https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3917)

New description:

 Update `MutableChecker` tests in src/allmydata/test/test_storage.py to
 either use `SyncTestCase` or `AsyncTestCas`e base test case and not
 `unittest.TestCase`

 This refactor would also involve using new and better assertion methods.

 Just like in [3917](https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3917)

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3918#comment:1>
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