public FakeAccountRepository(IEnumerable<BizAccountRegistrationData> initialRegDatas, ISecurityProvider securityProvider)
        {
            _accounts = new Dictionary<long, AccountRec>();

            if (initialRegDatas != null)
            {
                foreach (var rd in initialRegDatas)
                {
                    BizAccount acc = WagenBackendHelper.AccountRegistrationDataToAccount(rd);
                    string hash = securityProvider.GetPasswordHashString(rd.Password);

                    this.AddAccount(acc, hash);
                }
            }
        }