public int ConvertHexCharToInteger_CharIsValid_ReturnsInteger(char c)
 {
     return(ThrowingExceptions.ConvertHexCharToInteger(c));
 }
 public void ConvertHexCharToInteger_CharIsInvalid_ThrowsArgumentException(char c)
 {
     Assert.Throws <ArgumentException>(() => ThrowingExceptions.ConvertHexCharToInteger(c));
 }