public IncomeService(IIncomeContext <decimal> incomeContext)
{
_incomeContext = incomeContext ?? throw new ArgumentNullException(nameof(incomeContext));
}
/// <summary>
/// this is for testing purpose, we can remove this when we implement IOC framework like Unit framework
/// </summary>
internal IncomeRepository(IIncomeContext context)
{
_context = context;
}
