public void MergeWithNextWithPlusOperatorShouldSetNextPointer()
{
var exp1 = new IntegerExpression("1");
exp1.Operator = Operator.Plus;
var exp2 = new IntegerExpression("2");
exp1.Next = exp2;
var result = exp1.MergeWithNext();
Assert.IsNull(result.Next);
}
public void MergeWithNextWithPlusOperatorShouldCalulateSumCorrectly()
{
var exp1 = new IntegerExpression("1");
exp1.Operator = Operator.Plus;
var exp2 = new IntegerExpression("2");
exp1.Next = exp2;
var result = exp1.MergeWithNext();
Assert.AreEqual(3d, result.Compile().Result);
}