public void Print_ShouldPrintExpression()
{
var a = new Lit(7);
var b = new Lit(8);
var sub = new SubInt(a, b);
Assert.That(sub.Print(), Is.EqualTo("7-8"));
}
public void Eval_ShouldAddTwoInteger()
{
var a = new Lit(7);
var b = new Lit(8);
var sub = new SubInt(a, b);
Assert.That(sub.Eval(), Is.EqualTo(-1));
}