[MERGE] fix up test_bench_history

[Aaron Bentley]

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Martin Pool wrote:
> It seems a little strange to me to have an assert* routine return the
> result of the thing it called.  If the point is to call the thing and
> incidentally check it's deprecated perhaps it should be
> self.callDeprecated(..)?
> 
I'm okay with that if Robert is.

The intent so far has been to call deprecated functions, and ensure that
the correct deprecation warnings are issued.  However, it can also be
used as a way to call functions while ignoring deprecations.

Aaron
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