public void Print_ShouldPrintAddExpression()
{
var a = new Lit(7);
var b = new Lit(8);
var add = new AddInt(a, b);
Assert.That(add.Print(), Is.EqualTo("7+8"));
}
public void Eval_ShouldAddTwoInteger()
{
var a = new Lit(7);
var b = new Lit(8);
var add = new AddInt(a, b);
Assert.That(add.Eval(), Is.EqualTo(15));
}