Converted Observatory nav-menu element

runtime/observatory/tests/observatory_ui/nav/menu/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.dart';
+
+main() {
+  NavMenuElement.tag.ensureRegistration();
+
+  group('instantiation', () {
+    final label = 'custom-label';
+    test('label', () {
+      final NavMenuElement e = new NavMenuElement(label);
+      expect(e, isNotNull, reason: 'element correctly created');
+      expect(e.label, equals(label), reason: 'element correctly created');
+    });
+    test('not last', () {
+      final NavMenuElement e = new NavMenuElement(label, last: false);
+      expect(e, isNotNull, reason: 'element correctly created');
+      expect(e.last, isFalse, reason: 'element correctly created');
+    });
+    test('last', () {
+      final NavMenuElement e = new NavMenuElement(label, last: true);
+      expect(e, isNotNull, reason: 'element correctly created');
+      expect(e.last, isTrue, reason: 'element correctly created');
+    });
+  });
+  group('elements', () {
+    test('created', () async {
+      final label = 'custom-label';
+      final NavMenuElement e = new NavMenuElement(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 NavMenuElement e = new NavMenuElement(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 last change', () async {
+      final label = 'custom-label';
+      final NavMenuElement e = new NavMenuElement(label, last: false);
+      document.body.append(e);
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains('>'), isTrue);
+      e.last = true;
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains('>'), isFalse);
+      e.last = false;
+      await e.onRendered.first;
+      expect(e.shadowRoot.innerHtml.contains('>'), isTrue);
+      e.remove();
+      await e.onRendered.first;
+    });
+  });
+}