public override void Given()
        {
            SearchRegistrationViewModel = new SearchRegistrationViewModel {
                SearchUln = SearchUln
            };
            var mockResult = new UlnRegistrationNotFoundViewModel {
                IsAllowed = true, Uln = SearchUln
            };

            RegistrationLoader.FindUlnAsync(AoUkprn, SearchUln.ToLong()).Returns(mockResult);
        }
        public override void Given()
        {
            var findUln = new UlnRegistrationNotFoundViewModel
            {
                IsAllowed = true
            };

            UlnViewModel = new UlnViewModel {
                Uln = "1234567890"
            };
            RegistrationLoader.FindUlnAsync(Arg.Any <long>(), Arg.Any <long>()).Returns(findUln);
        }