public async Task AddClaimsAsync()
        {
            using (var uow = _unitOfWorkManager.Begin())
            {
                var user = await _userRepository.FindByNormalizedUserNameAsync(_lookupNormalizer.Normalize("john.nash"));

                user.ShouldNotBeNull();

                await _identityUserStore.AddClaimsAsync(user, new List <Claim>()
                {
                    new Claim("MyClaimType", "MyClaimValue")
                });

                user.Claims.ShouldContain(x => x.ClaimType == "MyClaimType" && x.ClaimValue == "MyClaimValue");

                await uow.CompleteAsync();
            }
        }