public void Convert_InvalidTest()
{
FinanceManager financeManager = new FinanceManager();
double amount = 1000;
ICurrency currency = FinantialDB.Currency["EUR"];
Assert.Throws <ArgumentNullException>(() => financeManager.Convert(null, amount));
}
public void Convert_ValidTest()
{
FinanceManager financeManager = new FinanceManager();
double amount = 1000;
ICurrency currency = FinantialDB.Currency["EUR"];
double convertAmount = financeManager.Convert(currency, amount);
Assert.AreEqual(convertAmount, amount * currency.Value);
}