LibTest/html/Element/append_A02_t02.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.
 */
/**
 * @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 even if
 * it is not a direct child of this node.
 */
import "dart:html";
import "../../../Utils/expect.dart";

main() {
  var x = new Element.html('<span><button><div></div></button></span>');
  var y = x.querySelector('div');
  if (y != null) {
    Expect.isNotNull(x.firstChild?.firstChild);

    x.append(y);

    Expect.isNull(x.firstChild?.firstChild);

    Expect.equals(y, x.lastChild);
  } else {
    Expect.fail("No 'div' element found");
  }
}