public void TestAdding()
{
var n = new Node("node", new Dictionary <string, SDF>(), new List <SDF>());
var matches = n.Find("/[has_child(subnode)]");
Assert.AreEqual(0, matches.Count);
n.AddChild("/", new Node("subnode", new Dictionary <string, SDF>(), new List <SDF>()));
matches = n.Find("/[has_child(subnode)]");
Assert.AreEqual(1, matches.Count);
Assert.AreEqual(n, matches[0].Value);
matches = n.Find("/[has_attr(attr)]");
Assert.AreEqual(0, matches.Count);
n.AddAttribute("/", "attr", new BooleanLiteral(true));
matches = n.Find("/[has_attr(attr)]");
Assert.AreEqual(1, matches.Count);
Assert.AreEqual(n, matches[0].Value);
matches = n.Find("[@attr=true]");
Assert.AreEqual(1, matches.Count);
Assert.AreEqual(n, matches[0].Value);
matches = n.Find("[@attr!=false]");
Assert.AreEqual(1, matches.Count);
Assert.AreEqual(n, matches[0].Value);
}