public async Task TestGetValueUSD()
{
string iso = "USD";
CurrencyRepository currency = CurrencyRepository.GetCurrencyRepositoryByISO(iso);
CurrencyModel model = await currency.GetCurrency();
Assert.IsNotNull(model, "model should not be null");
Assert.AreEqual(typeof(CurrencyModel), model.GetType(), "model must to be type of CurrencyModel");
Assert.AreEqual(typeof(decimal), model.PurchasePrice.GetType(), "PurchasePrice must to be type of decimal");
Assert.AreEqual(typeof(decimal), model.SalePrice.GetType(), "SalePrice must to be type of decimal");
Assert.IsNotNull(model.PurchasePrice, "currency should not be null due implemented repositories");
}