public void SourceBoxCoordinatesChanged_When_DragAndDropped()
{
double sourcePosXBefore = _droppablePage.SourceBox.Location.X;
double sourcePosYBefore = _droppablePage.SourceBox.Location.Y;
Builder.DragAndDropToOffset(_droppablePage.SourceBox.WrappedElement, 200, 150).Perform();
double sourcePosXAfter = _droppablePage.SourceBox.Location.X;
double sourcePosYAfter = _droppablePage.SourceBox.Location.Y;
_droppablePage.AssertCoordinates(612, sourcePosXBefore, 3);
_droppablePage.AssertCoordinates(302, sourcePosYBefore, 3);
_droppablePage.AssertCoordinates(812, sourcePosXAfter, 3);
_droppablePage.AssertCoordinates(452, sourcePosYAfter, 3);
}