[rfc] list tests known to fail on a platform

[John Arbash Meinel]

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...
>> blackbox.test_info.TestInfo.test_info_locking     XFAIL
>> 553ms
>>    OS locks are exclusive for different processes (Bug #174055)
>>
>> Which interestingly enough looks like the exact same issue causing the
>> LockContention failures.
> 
> I was going to say this is a poor use of xfail, but on consideration I
> think it's just a poor message.  We can't change that OS locks work
> this way.  The problem really is that our format uses them to guard
> access to trees of this format.

So at least at one point there was an idea that running the test suite
might give you an indication of what was / wasn't supported. And that
XFAIL could be used to tell you about those.

John
=:->

> 
> For existing formats we can't change the locking protocol and so it's
> not worth reporting that they have this limitation.  However I guess
> it is an ongoing bug that there is no current format that doesn't use
> OS locks.
> 
>> I think we can get the number of failures small enough on Windows to manage
>> individually...
> 
> That would be great.
> 

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