public async Task CheckAccountNotPresent()
        {
            var areas = await areaProvider.AreasAsync();

            Area   area   = areas.FirstOrDefault();
            string areaId = area.Id.ToString();

            var accountNotPresent = await roleProvider.AccountNotPresentAsync(areaId);

            Assert.NotEmpty(accountNotPresent);
            Assert.IsAssignableFrom <List <Account> >(accountNotPresent);
        }