public void WhenAutoConversionSelectorIsPassedEmptyStringItThrowsAnException()
 {
     Assert.ThrowsException <ArgumentException>(() => ConversionAutoSelector.ConvertInput(""));
 }
 public void WhenAutoConversionSelectorIsPassedRomanNumeralsItReturnsArabicNumerals()
 {
     Assert.IsTrue("9" == ConversionAutoSelector.ConvertInput("IX"));
 }