Centralized event streams

runtime/observatory/tests/observatory_ui/nav/refresh/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 'dart:async';
 import 'package:unittest/unittest.dart';
 import 'package:observatory/src/elements/nav/refresh.dart';
 
 main() {
   NavRefreshElement.tag.ensureRegistration();
+
   group('instantiation', () {
     test('no parameters', () {
-      final NavRefreshElement e = new NavRefreshElement();
+      final e = new NavRefreshElement();
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.label, isNotNull, reason: 'label is set to default');
       expect(e.disabled, isFalse, reason: 'element correctly created');
     });
     test('label', () {
       final label = 'custom-label';
-      final NavRefreshElement e = new NavRefreshElement(label: label);
+      final e = new NavRefreshElement(label: label);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.label, isNotNull, reason: 'label is set');
       expect(e.label, equals(label), reason: 'label is set to value');
     });
     test('not disabled', () {
-      final NavRefreshElement e = new NavRefreshElement(disabled: false);
+      final e = new NavRefreshElement(disabled: false);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.disabled, isFalse, reason: 'element correctly created');
     });
     test('disabled', () {
-      final NavRefreshElement e = new NavRefreshElement(disabled: true);
+      final e = new NavRefreshElement(disabled: true);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.disabled, isTrue, reason: 'element correctly created');
     });
   });
   group('elements', () {
     test('created after attachment', () async {
-      final NavRefreshElement e = new NavRefreshElement();
+      final e = new NavRefreshElement();
       document.body.append(e);
       await e.onRendered.first;
       expect(e.children.length, isNonZero, reason: 'has elements');
       e.remove();
       await e.onRendered.first;
       expect(e.children.length, isZero, reason: 'is empty');
     });
     test('contain custom label', () async {
       final label = 'custom-label';
-      final NavRefreshElement e = new NavRefreshElement(label: label);
+      final e = new NavRefreshElement(label: label);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.innerHtml.contains(label), isTrue);
       e.remove();
       await e.onRendered.first;
     });
     test('react to label change', () async {
       final label1 = 'custom-label-1';
       final label2 = 'custom-label-2';
-      final NavRefreshElement e = new NavRefreshElement(label: label1);
+      final e = new NavRefreshElement(label: label1);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.innerHtml.contains(label1), isTrue);
       expect(e.innerHtml.contains(label2), isFalse);
       e.label = label2;
       await e.onRendered.first;
       expect(e.innerHtml.contains(label2), isTrue);
       expect(e.innerHtml.contains(label1), isFalse);
       e.remove();
       await e.onRendered.first;
     });
     test('react to disabled change', () async {
-      final NavRefreshElement e = new NavRefreshElement(disabled: false);
+      final e = new NavRefreshElement(disabled: false);
       document.body.append(e);
       await e.onRendered.first;
       expect(e.disabled, isFalse);
       e.disabled = true;
       await e.onRendered.first;
       expect(e.disabled, isTrue);
       e.remove();
       await e.onRendered.first;
     });
   });
@@ skipping 31 matching lines @@
       sub = e.onRefresh.listen(expectAsync((_) {}, count: 0));
       e.refresh();
     });
     test('does not fires on click if disabled', () async {
       e.disabled = true;
       sub = e.onRefresh.listen(expectAsync((_) {}, count: 0));
       e.querySelector('button').click();
     });
   });
 }