[MERGE] Support old API properly

[Aaron Bentley]

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John Arbash Meinel wrote:
> When testing deprecated APIs, the way I test them is to have them not
> directly import warnings.warn or symbol_versioning.warn. Instead to
> import symbol_versioning.
> 
> After that, there is the helper function:
> symbol_versioning.set_warning_method()
> 
> This lets you override the default warning method with a collector. And
> then you have the opportunity to both assert that the deprecation is
> being emitted *and* that it does the right thing.

Thanks for the tip.  I didn't realize we had that.

I believe this method is generally useful, so I have automated it as
assertDeprecated (similar to assertRaises).

Aaron
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