Cleaning up the TableElement API

tests/html/table_test.dart

 // Copyright (c) 2012, 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 TableTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlConfiguration();
 
   test('createTBody', () {
     var table = new TableElement();
     var head = table.createTHead();
-    var headerRow =  head.insertRow(-1);
-    var headerCell = headerRow.insertCell(-1);
+    expect(table.tHead, head);
+
+    var headerRow =  head.addRow();
+    var headerCell = headerRow.addCell();
     headerCell.text = 'Header Cell';
 
+    var caption = table.createCaption();
+    expect(table.caption, caption);
+
     var body = table.createTBody();
-    var bodyRow =  body.insertRow(-1);
-    var bodyCell = bodyRow.insertCell(-1);
-    bodyCell.text = 'Body Cell';
-
     expect(table.tBodies.length, 1);
     expect(table.tBodies[0], body);
 
+    var bodyRow =  body.addRow();
+    expect(body.rows.length, 1);
+    expect(body.rows[0], bodyRow);
+
+    var bodyCell = bodyRow.addCell();
+    bodyCell.text = 'Body Cell';
+    expect(bodyRow.cells.length, 1);
+    expect(bodyRow.cells[0], bodyCell);
+
     var foot = table.createTFoot();
-    var footerRow =  foot.insertRow(-1);
-    var footerCell = footerRow.insertCell(-1);
+    expect(table.tFoot, foot);
+
+    var footerRow =  foot.addRow();
+    expect(foot.rows.length, 1);
+    expect(foot.rows[0], footerRow);
+
+    var footerCell = footerRow.addCell();
     footerCell.text = 'Footer Cell';
+    expect(footerRow.cells.length, 1);
+    expect(footerRow.cells[0], footerCell);
 
     var body2 = table.createTBody();
-    var bodyRow2 =  body2.insertRow(-1);
-    var bodyCell2 = bodyRow2.insertCell(-1);
+    var bodyRow2 =  body2.addRow();
+    var bodyCell2 = bodyRow2.addCell();
     bodyCell2.text = 'Body Cell2';
 
+    expect(body2.rows.length, 1);
+
     expect(table.tBodies.length, 2);
     expect(table.tBodies[1], body2);
-
   });
 }