LibTest/html/Document/append_A02_t01.dart

// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart = 2.9

/// @assertion Node append(Node newChild)
/// If the node already exists in this document, it will be removed from its 
/// current parent node, then added to this node.
/// @description Checks that existing node will be removed before append

import "dart:html";
import "../../../Utils/expect.dart";

main() {
  var l0 = document.nodes.length;
  var x = new Element.html('<span><button></button></span>');
  var y = new Comment("cool");
  x.append(y);
  Expect.equals(y, x.lastChild);

  document.append(y);

  Expect.equals(l0 + 1, document.nodes.length);
  Expect.isTrue(x.firstChild is ButtonElement);
  Expect.equals(y, document.lastChild);
}