Drag and drop (map panning) with protractor

I'm trying to automatize a drag&drop action with Protractor/Selenium to check that a map based on tiles (leaflet library) is correctly working, but I can't automate the drag&drop action (panning the map). I have loaded a page with a map, like this one: http://tombatossals.github.io/angular-leaflet-directive/examples/center-example.html And this protractor test doesn't pan the map, the dragAndDrop action over the selected image doesn't seem work. ``` describe('Panning map', function() { var ptor, driver; beforeEach(function() { ptor = protractor.getInstance(); browser.get('center-example.html'); driver = ptor.driver; }, 30000); it('should update the center value if the map is dragged', function() { var el = element(by.xpath('.//img[contains(@class, "leaflet-tile-loaded")][1]')); browser.actions().dragAndDrop(el.find(), { x: 40, y: 40 }).perform(); ptor.sleep(2000); expect(element(by.model("london.lat")).getAttribute("value")).toBe('51.505'); expect(element(by.model("london.lng")).getAttribute("value")).toBe('-1.09'); }); }); ``` Which can be the reason for a dragAndDrop action not to apply on an example like this?