Start cleaning up the HTML tests.

pkg/dev_compiler/test/codegen/lib/html/custom_elements_test.dart

 // Copyright (c) 2013, 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 custom_elements_test;
 import 'dart:async';
 import 'dart:html';
 import 'package:unittest/html_individual_config.dart';
 import 'package:unittest/unittest.dart';
 import 'utils.dart';
@@ skipping 30 matching lines @@
 main() {
   useHtmlIndividualConfiguration();
 
   setUp(() => customElementsReady);
 
   group('register', () {
     test('register', () {
       var tag = nextTag;
       document.registerElement(tag, CustomType);
 
-      var element = new Element.tag(tag);
+      var element = new Element.tag(tag) as CustomType;
       expect(element, isNotNull);
       expect(element is CustomType, isTrue);
       expect(element.createdCalled, isTrue);
     });
 
     test('register twice', () {
       var tag = nextTag;
       document.registerElement(tag, CustomType);
       expect(() {
         document.registerElement(tag, CustomType);
       }, throws, reason: 'Cannot register a tag more than once.');
 
       var newTag = nextTag;
       document.registerElement(newTag, CustomType);
 
-      var element = new Element.tag(newTag);
+      var element = new Element.tag(newTag) as CustomType;
       expect(element, isNotNull);
       expect(element is CustomType, isTrue);
     });
 
     test('register null', () {
       expect(() {
         document.registerElement(nextTag, null);
       }, throws, reason: 'Cannot register a null type.');
     });
 
@@ skipping 53 matching lines @@
 
   group('innerHtml', () {
     test('query', () {
       var tag = nextTag;
       document.registerElement(tag, CustomType);
       var element = new DivElement();
       element.setInnerHtml('<$tag></$tag>',
           treeSanitizer: new NullTreeSanitizer());
           upgradeCustomElements(element);
       document.body.nodes.add(element);
-      var queried = query(tag);
+      var queried = query(tag) as CustomType;
 
       expect(queried, isNotNull);
       expect(queried is CustomType, isTrue);
       expect(queried.createdCalled, isTrue);
     });
 
     test('query id', () {
       var tag = nextTag;
       document.registerElement(tag, CustomType);
       var element = new DivElement();
       element.setInnerHtml('<$tag id="someid"></$tag>',
           treeSanitizer: new NullTreeSanitizer());
           upgradeCustomElements(element);
       document.body.nodes.add(element);
-      var queried = query('#someid');
+      var queried = query('#someid') as CustomType;
 
       expect(queried, isNotNull);
       expect(queried is CustomType, isTrue);
       expect(queried.id, "someid");
     });
   });
 
   group('lifecycle', () {
     test('created', () {
       int oldCount = customCreatedCount;
       var tag = nextTag;
       document.registerElement(tag, CustomType);
       var element = new DivElement();
       element.setInnerHtml('<$tag></$tag>',
           treeSanitizer: new NullTreeSanitizer());
       upgradeCustomElements(element);
       document.body.nodes.add(element);
       expect(customCreatedCount, oldCount + 1);
     });
   });
 
   group('mixins', () {
     test('can invoke mixin methods', () {
       var tag = nextTag;
       document.registerElement(tag, CustomType);
 
-      var element = new Element.tag(tag);
+      var element = new Element.tag(tag) as CustomType;
       element.invokeMixinMethod();
       expect(element.mixinMethodCalled, isTrue);
     });
   });
 }