[Distutils] [buildout] including optional python packages for testing

[Chris Withers]

Hi All,

I'm using buildout to develop a package that uses sqlalchemy and 
sqlalchemy-migrate.

As a result, I'd like to test with various real database drivers; mysql, 
postgres, etc.

However, I don't want to force anyone who wants to check out and run the 
tests to have all supported database drivers available and compiled.

So, I'm looking for some way of specifying "optional eggs" when running 
the buildout, and not in buildout.cfg so they don't accidentally get 
checked in.

How can I achieve this?

cheers,

Chris

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