using Age.Engine.Sys4;
using Xunit;

public class Sys4StringCodecTests
{
    [Fact]
    public void DecodesXorFfCp932Ascii()
    {
        // "AB\0\0" little-endian = 0x00004241, stored XOR 0xFFFFFFFF
        uint[] dw = { 0x00004241u ^ 0xFFFFFFFFu };
        var (text, nd) = Sys4StringCodec.Decode(dw, 0);
        Assert.Equal("AB", text);
        Assert.Equal(1, nd);
    }

    [Fact]
    public void RejectsNonString()
    {
        // 0x00000000 XOR-decodes to bytes 0xFF,0xFF,0xFF,0xFF -> no NUL, invalid
        uint[] dw = { 0x00000000u };
        var (text, _) = Sys4StringCodec.Decode(dw, 0);
        Assert.Null(text);
    }
}