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);
}