public void LLConfStackConstructorTest()
{
CharSymbol chSym = new CharSymbol('A');
var stack = new Stack <DfaState <CharSymbol> >();
stack.Push(states["A1"]);
stack.Push(states["A2"]);
var imList = ImmutableList.Create(states["A1"], states["A2"]);
var ll = new LlConfiguration <CharSymbol>(chSym, stack);
Console.WriteLine("LL -> " + ll);
Assert.AreEqual(chSym, ll.label);
Assert.AreEqual(imList, ll.stack);
}