public void IsCurrencyValid_ValidCurrency_ReturnsTrue()
 {
     var currencyValidator = new CurrencyValidator();
     var isValid = currencyValidator.IsCurrencyValid(_validCurrency);
     Assert.IsTrue(isValid);
 }
 public void IsCurrencyValid_InvalidCurrency_ReturnsFalse()
 {
     var currencyValidator = new CurrencyValidator();
     var isValid = currencyValidator.IsCurrencyValid(_invalidCurrency);
     Assert.IsFalse(isValid);
 }