Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/form_element_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 FormElementTest;
+
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+void main() {
+  useHtmlConfiguration();
+
+  var isFormElement = predicate((x) => x is FormElement, 'is a FormElement');
+
+  test('constructorTest1', () {
+    var form = new FormElement();
+    expect(form, isNotNull);
+    expect(form, isFormElement);
+  });
+
+  test('checkValidityTest', () {
+    var form = new FormElement();
+    form.innerHtml = '<label>Google: <input type="search" name="q"></label> '
+                     '<input type="submit" value="Search...">';
+    expect(form.checkValidity(), isTrue);
+    // TODO(efortuna): Issue 4832.
+    form.innerHtml = '<input type="email" value="notemail" blaber="test"'
+                     ' required>';
+    expect(form.checkValidity(), isFalse);
+  });
+
+  var form = new FormElement();
+  test('acceptCharsetTest', () {
+    var charset = 'abc';
+    form.acceptCharset = charset;
+    expect(form.acceptCharset, charset);
+  });
+
+  test('actionTest', () {
+    var action = 'http://dartlang.org/';
+    form.action = action;
+    expect(form.action, action);
+  });
+
+  test('autocompleteTest', () {
+    var auto = 'on';
+    form.autocomplete = auto;
+    expect(form.autocomplete, auto);
+  });
+
+  test('encodingAndEnctypeTest', () {
+    expect(form.enctype, form.encoding);
+  });
+
+  test('lengthTest', () {
+    expect(form.length, 0);
+    form.innerHtml = '<label>Google: <input type="search" name="q"></label> '
+                     '<input type="submit" value="Search...">';
+    expect(form.length, 2);
+  });
+
+  test('methodTest', () {
+    var method = 'post';
+    form.method = method;
+    expect(form.method, method);
+  });
+
+  test('nameTest', () {
+    var name = 'aname';
+    form.name = name;
+    expect(form.name, name);
+  });
+
+  test('noValidateTest', () {
+    form.noValidate = true;
+    expect(form.noValidate, true);
+  });
+
+  test('targetTest', () {
+    var target = 'target';
+    form.target = target;
+    expect(form.target, target);
+  });
+}