Port custom element layout tests to Dart

tests/html/custom_element_attribute_changed_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_element_attribute_changed_test;
+import '../../pkg/unittest/lib/unittest.dart';

[blois, 2013/08/16 23:37:48]

we should use package: imports for new tests.

[vsm, 2013/08/19 17:00:10]

Done.

+import '../../pkg/unittest/lib/html_individual_config.dart';
+import 'dart:html';
+
+class CustomA extends HtmlElement {

[Siggi Cherem (dart-lang), 2013/08/16 23:02:19]

so so so awesome!

+  static final tag = 'x-a';
+  factory CustomA() => new Element.tag(tag);
+
+  static var attributeChangedInvocations = 0;
+
+  void onAttributeChanged(name, oldValue, newValue) {
+    attributeChangedInvocations++;
+  }
+}
+
+class CustomB extends HtmlElement {
+  static final tag = 'x-b';
+  factory CustomB() => new Element.tag(tag);
+
+  static var invocations = [];
+
+  void onCreated() {
+    invocations.add('created');
+  }
+
+  void onAttributeChanged(name, oldValue, newValue) {
+    invocations.add('$name: $oldValue => $newValue');
+  }
+}
+
+main() {
+  useHtmlIndividualConfiguration();
+
+  // Adapted from Blink's fast/dom/custom/attribute-changed-callback test.
+  group('callback', () {
+    test('transfer attribute changed callback', () {
+      document.register(CustomA.tag, CustomA);
+      var element = new CustomA();
+
+      element.attributes['a'] = 'b';
+      expect(CustomA.attributeChangedInvocations, 1);
+    });
+
+    test('add, change and remove an attribute', () {
+      document.register(CustomB.tag, CustomB);
+      var b = new CustomB();
+      b.id = 'x';
+      expect(CustomB.invocations, ['created', 'id: null => x']);
+
+      CustomB.invocations = [];
+      b.attributes.remove('id');
+      expect(CustomB.invocations, ['id: x => null']);
+
+      CustomB.invocations = [];
+      b.attributes['data-s'] = 't';
+      expect(CustomB.invocations, ['data-s: null => t']);
+
+      CustomB.invocations = [];
+      b.classList.toggle('u');
+      expect(CustomB.invocations, ['class: null => u']);
+
+      b.attributes['data-v'] = 'w';
+      CustomB.invocations = [];
+      b.attributes['data-v'] = 'x';
+      expect(CustomB.invocations, ['data-v: w => x']);
+
+      CustomB.invocations = [];
+      b.attributes['data-v'] = 'x';
+      expect(CustomB.invocations, []);
+    });
+  });
+}