public void RomanNumeral_Parse_InvalidClassicNotation()
{
//substractive notation
Assert.IsNull(RomanNumeral.Parse("IV"));
Assert.IsNull(RomanNumeral.Parse("IX"));
//invalid order
Assert.IsNull(RomanNumeral.Parse("IVL"));
//valid order
Assert.IsNotNull(RomanNumeral.Parse("LVI"));
}
public void RomanNumeral_Assign_Int()
{
RomanNumeral x = 4;
Assert.AreEqual(4, x.Number);
}
public void RomanNumeral_Add_Int()
{
var x = new RomanNumeral(0) + 4;
Assert.AreEqual(4, x.Number);
}
public void RomanNumeral_Add_StringAndInt()
{
var x = new RomanNumeral(0) + "IV" + 4;
Assert.AreEqual(8, x.Number);
}
public void RomanNumeral_Assign_String()
{
RomanNumeral x = "IV";
Assert.AreEqual(4, x.Number);
}
public void RomanNumeral_Add_IntAndString()
{
var x = new RomanNumeral(0) + 4 + "IV";
Assert.AreEqual(8, x.Number);
}
public void RomanNumeral_Add_String()
{
var x = new RomanNumeral(0) + "IV";
Assert.AreEqual(4, x.Number);
}
public static string operator -(string r1, RomanNumeral r2)
{
var r = RomanNumeral.Parse(r1) + r2;
return(r.ToString());
}
public static int operator -(int r1, RomanNumeral r2)
{
var r = new RomanNumeral(r1) - r2;
return(r.Number);
}
public static RomanNumeral operator +(RomanNumeral r1, string r2)
{
return(r1 + RomanNumeral.Parse(r2));
}