Make html lists print a nice toString method.

tests/html/node_test.dart

 // Copyright (c) 2011, 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.
 
 library NodeTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 import 'dart:svg' as svg;
 
 Node makeNode() => new Element.tag('div');
 Node makeNodeWithChildren() =>
   new Element.html("<div>Foo<br/><!--baz--></div>");
 
 main() {
   useHtmlIndividualConfiguration();
 
   var isText = predicate((x) => x is Text, 'is a Text');
   var isComment = predicate((x) => x is Comment, 'is a Comment');
   var isBRElement = predicate((x) => x is BRElement, 'is a BRElement');
   var isHRElement = predicate((x) => x is HRElement, 'is a HRElement');
   var isNodeList = predicate((x) => x is List<Node>, 'is a List<Node>');
   var isImageElement =
       predicate((x) => x is ImageElement, 'is an ImageElement');
   var isInputElement =
       predicate((x) => x is InputElement, 'is an InputElement');
 
   group('functional', () {
+    test('toString', () {
+      final nodes = makeNodeWithChildren();
+      // TODO(efortuna): Update this test when you have actual toString methods
+      // for the items in the node List as well.
+      expect(nodes.nodes.toString(), "[Instance of 'Text', BR, "
+          "Instance of 'Comment']");
+      final node = makeNode();
+      expect(node.nodes.toString(), '[]');
+    });
+
     test('replaceWith', () {
       final node = makeNodeWithChildren();
       final subnode = node.nodes[1];
       final out = subnode.replaceWith(new Text('Bar'));
       expect(out, equals(subnode), reason: '#replaceWith should be chainable');
       expect(node.nodes.length, 3);
       expect(node.nodes[0], isText);
       expect(node.nodes[0].text, 'Foo');
       expect(node.nodes[1], isText);
       expect(node.nodes[1].text, 'Bar');
@@ skipping 231 matching lines @@
     });
 
     test('sublist', () {
       var range = makeNodeList().sublist(1, 3);
       expect(range, isNodeList);
       expect(range[0], isBRElement);
       expect(range[1], isComment);
     });
   });
 }