[pixel shader]
float4 main() : SV_target
{
    float4 ret;
    ret.yw.y = 0.1;
    ret.xzy.yz.y.x = 0.2;
    ret.yzwx.yzwx.wz.y = 0.3;
    ret.zxy.xyz.zxy.xy.y = 0.4;
    return ret;
}

[test]
draw quad
probe all rgba (0.3, 0.2, 0.4, 0.1)