public void vatConverstion()
{
//input
decimal buyingAmount = 100;
decimal vatRate = 20;
decimal CATTC = 200m;
decimal CAHT = 166.67m;
decimal BenefitTTC = 200m;
decimal BenefitHT = 183.33m;
if (Math.Round(PriceHelper.GetPriceHTFromPriceTTCOnRevenu(CATTC, vatRate), 2) != CAHT)
{
throw new Exception();
}
if (Math.Round(PriceHelper.GetPriceTTCFromPriceHTOnRevenu(CAHT, vatRate), 2) != CATTC)
{
throw new Exception();
}
if (Math.Round(PriceHelper.GetPriceHTFromPriceTTCOnProfit(BenefitTTC, buyingAmount, vatRate), 2) != BenefitHT)
{
throw new Exception();
}
if (Math.Round(PriceHelper.GetPriceTTCFromPriceHTOnProfit(BenefitHT, buyingAmount, vatRate), 2) != BenefitTTC)
{
throw new Exception();
}
}