Wrapping leaf nodes in non polymer elements

runtime/observatory/tests/observatory_ui/error_ref/element_test.dart

Index: runtime/observatory/tests/observatory_ui/error_ref/element_test.dart
diff --git a/runtime/observatory/tests/observatory_ui/error_ref/element_test.dart b/runtime/observatory/tests/observatory_ui/error_ref/element_test.dart
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+// 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/models.dart';
+import 'package:observatory/mocks.dart';
+import 'package:observatory/src/elements/error_ref.dart';
+
+main() {
+  ErrorRefElement.tag.ensureRegistration();
+
+  final ErrorRef ref = new ErrorRefMock(id: 'id', message: 'fixed-error-m');
+  test('instantiation', () {
+    final ErrorRefElement e = new ErrorRefElement(ref);
+    expect(e, isNotNull, reason: 'element correctly created');
+    expect(e.error, equals(ref));
+  });
+  test('elements created after attachment', () async {
+    final ErrorRefElement e = new ErrorRefElement(ref);
+    document.body.append(e);
+    await e.onRendered.first;
+    expect(e.children.length, isNonZero, reason: 'has elements');
+    expect(e.innerHtml.contains(ref.message), isTrue,
+      reason: 'no message in the component');
+    e.remove();
+    await e.onRendered.first;
+    expect(e.children.length, isZero,
+      reason: 'is empty');
+  });
+}