Converted Observatory nav-menu-item element

runtime/observatory/tests/observatory_ui/nav/menu-item/element_test.dart

+// Copyright (c) 2016, 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.
+import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:observatory/src/elements/nav/menu_item.dart';
+
+main() {
+  NavMenuItemElement.tag.ensureRegistration();
+
+  group('instantiation', () {
+    final label = 'custom-label';
+    final link = 'link-to-target';
+    test('label', () {
+      final NavMenuItemElement e = new NavMenuItemElement(label);
+      expect(e, isNotNull, reason: 'element correctly created');
+      expect(e.label, equals(label), reason: 'element correctly created');
+    });
+    test('label', () {
+      final NavMenuItemElement e = new NavMenuItemElement(label, link: link);
+      expect(e, isNotNull, reason: 'element correctly created');
+      expect(e.link, equals(link), reason: 'element correctly created');
+    });
+  });
+  group('elements', () {
+    test('created', () async {
+      final label = 'custom-label';
+      final NavMenuItemElement e = new NavMenuItemElement(label);
+      document.body.append(e);
+      await e.onRendered.first;
+      expect(e.shadowRoot.children.length, isNonZero, reason: 'has elements');
+      expect(e.shadowRoot.querySelector('content'), isNotNull,
+                                                 reason: 'has content elements');
+      e.remove();
+      await e.onRendered.first;
+      expect(e.shadowRoot.children.length, isZero, reason: 'is empty');
+    });
+    test('react to label change', () async {
+      final label1 = 'custom-label-1';
+      final label2 = 'custom-label-2';
+      final NavMenuItemElement e = new NavMenuItemElement(label1);
+      document.body.append(e);
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains(label1), isTrue);
+      expect(e.shadowRoot.innerHtml.contains(label2), isFalse);
+      e.label = label2;
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains(label1), isFalse);
+      expect(e.shadowRoot.innerHtml.contains(label2), isTrue);
+      e.remove();
+      await e.onRendered.first;
+    });
+    test('react to link change', () async {
+      final label = 'custom-label';
+      final link1 = 'custom-label-1';
+      final link2 = 'custom-label-2';
+      final NavMenuItemElement e = new NavMenuItemElement(label, link: link1);
+      document.body.append(e);
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains(link1), isTrue);
+      expect(e.shadowRoot.innerHtml.contains(link2), isFalse);
+      e.link = link2;
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains(link1), isFalse);
+      expect(e.shadowRoot.innerHtml.contains(link2), isTrue);
+      e.remove();
+      await e.onRendered.first;
+    });
+  });
+}