I add spec file for mixin and fix hagenburger/lemonade#11.
Spec file isn’t very pretty, but I didn’t brave to refactoring your project :). I think before and after filters must be move to some function in spec_helper.rb.
Also, I didn’t wrte specs for all mixins, because have problems. As I understand image-width is a Compass function and I didn’t know how to enable it in specs.
Fix sprite_image mixin and add specs file for mixins
I’m closing this because of some deprecation.