add geo hover tests

[etpinard]

@mdtusz @cldougl

part of #209

I found a nice way to determine the mouse (x,y) position. Open the Karma debugger, paste

document.onmousemove = function(evt) { console.log(evt.clientX, evt.clientY); };

and hover over the position where you're trying to simulate a mouse over.

[cldougl]

looks good to me 💃