[TIP] [tox] how to specify which "extras" to install when testing my package

[Chris Withers]

Hi All,

Although I use buildout to develop my packages, I'm hoping to use Tox to 
test that the packages work with all versions of Python and on all 
supported platforms.

In order to run the tests, I need to install with a setuptools "extras" 
requirements such as:

easy_install testfixtures[test]

How do I do that with Tox?

cheers,

Chris

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