Code review comment for lp:~ic90/openlp/animated-alerts

See the inline comments.

Also, in your tests you seem to be testing a single style every time, you should be able to combine those into a single test. For example:

   it("should set the correct styles when the location is the top of the page", function(){
       Display.doEntranceTransition("0");
       expect(alertBackground.style.top).toEqual('0px');
       expect(alertBackground.style.transition).toEqual("2s linear");
       expect(alertBackground.style.height).toEqual("25%");
   });