Figure out how to test our event handling and interaction modules.
Possible approaches:

JSDom. Pro: likely less unpredictability / hard-to-debug timing issues than a browser environment. Con: likely lower fidelity event implementation.
At this point in time, I would vote for this particular tradeoff. I think it would be the quickest way to get started and I'm betting a large majority of these tests would not require a super high fidelity event environment. (E.g. #2972 )
+ browser utilities (i.e. js/util/browser/*.js) 馃槃
We've been gradually filling these out.
Most helpful comment
At this point in time, I would vote for this particular tradeoff. I think it would be the quickest way to get started and I'm betting a large majority of these tests would not require a super high fidelity event environment. (E.g. #2972 )