Converted Observatory nav-notify element

runtime/observatory/tests/observatory_ui/nav/notify_exception/connection_exception_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/models.dart';
+import 'package:observatory/mocks.dart';
+import 'package:observatory/src/elements/nav/notify_exception.dart';
+
+main() {
+  NavNotifyExceptionElement.tag.ensureRegistration();
+
+  final ConnectionException exception =
+      new ConnectionExceptionMock(message: 'message');
+  test('instantiation', () {
+    final NavNotifyExceptionElement e =
+                                new NavNotifyExceptionElement(exception);
+    expect(e, isNotNull, reason: 'element correctly created');
+  });
+  test('elements created after attachment', () async {
+    final NavNotifyExceptionElement e =
+                                new NavNotifyExceptionElement(exception);
+    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');
+  });
+  group('events are fired', () {
+    NavNotifyExceptionElement e;
+    StreamSubscription sub;
+    setUp(() async {
+      e = new NavNotifyExceptionElement(exception);
+      document.body.append(e);
+      await e.onRendered.first;
+    });
+    tearDown(() {
+      sub.cancel();
+      e.remove();
+    });
+    test('navigation after connect', () async {
+      sub = window.onPopState.listen(expectAsync((_) {}, count: 1,
+        reason: 'event is fired'));
+      e.querySelector('a').click();
+    });
+    test('onDelete events (DOM)', () async {
+      sub = e.onDelete.listen(expectAsync((ExceptionDeleteEvent event) {
+        expect(event, isNotNull, reason: 'event is passed');
+        expect(event.exception, equals(exception),
+                                              reason: 'exception is the same');
+        expect(event.stacktrace, isNull);
+      }, count: 1, reason: 'event is fired'));
+      e.querySelector('button').click();
+    });
+    test('onDelete events (code)', () async {
+      sub = e.onDelete.listen(expectAsync((ExceptionDeleteEvent event) {
+        expect(event, isNotNull, reason: 'event is passed');
+        expect(event.exception, equals(exception),
+                                              reason: 'exception is the same');
+        expect(event.stacktrace, isNull);
+      }, count: 1, reason: 'event is fired'));
+      e.delete();
+    });
+  });
+}