public void LeaveRoom_ExistingRoom_RemovesUsername_ReturnIndexAction()
{
var mockDal = new Mock <IRoomDAL>();
var controller = new RoomsController(mockDal.Object, null);
var result = controller.Leave("test-user") as RedirectToRouteResult;
Assert.IsNotNull(result);
Assert.AreEqual("Index", result.RouteValues["action"]);
Assert.AreEqual("Rooms", result.RouteValues["controller"]);
mockDal.Verify(m => m.LeaveChatRooms("test-user"));
}