public void MarkShoppingListItemAsBoughtTest()
{
var sl = slService.GetFamilyShoppingList(currentUser.FamilyId).First();
slService.MarkShoppingListItemAsBought(currentUser.FamilyId, sl.Id);
Assert.IsInstanceOfType(sl, typeof(Core.DTO.ShoppingListItem));
Assert.IsFalse(slService.GetFamilyShoppingList(currentUser.FamilyId).Any(sli => sli.Id == sl.Id));
}