public void ArithGenTest()
{
var token = new Token('+');
var variable = new Id(new Word("x", Tag.ID), VarType.INT, 0);
var constant = new Constant(new Num(12), VarType.INT);
var arith = new Arith(token, variable, constant);
var expresion = arith.Gen();
Assert.AreEqual(VarType.INT, expresion.Type);
Assert.AreEqual(token, expresion.Op);
Assert.AreEqual("x + 12", expresion.ToString());
}