Testing

PhantomJS is a tool that should be considered for this regression checking, with only simple simple scripting it can be put into your Continuous Integration system and you have a way of catching regression early and before it goes for QA.

If you have a need to unit test a helper method which does a call to Action then you will hit an issue due to how HtmlHelper is not mockable and the call to Action will end up going through many layers and actually calling an action.

An example of how to use Selenium to do Multi-Browser Testing