Centralized event streams

runtime/observatory/tests/observatory_ui/script_ref/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/mocks.dart';
-import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/script_ref.dart';
+import '../mocks.dart';
 
 main() {
   ScriptRefElement.tag.ensureRegistration();
 
-  final M.IsolateRef isolate = const IsolateRefMock(id: 'isolate-id');
-  final M.ScriptRef ref = const ScriptRefMock(id: 'script-id',
-                                  uri: 'package/filename.dart');
+  const isolate = const IsolateRefMock(id: 'isolate-id');
+  const file = 'filename.dart';
+  const ref = const ScriptRefMock(id: 'script-id', uri: 'package/$file');
   group('instantiation', () {
     test('no position', () {
-      final ScriptRefElement e = new ScriptRefElement(isolate, ref);
+      final e = new ScriptRefElement(isolate, ref);
       expect(e, isNotNull, reason: 'element correctly created');
       expect(e.isolate, equals(isolate));
       expect(e.script, equals(ref));
     });
   });
   test('elements created after attachment', () async {
-    final ScriptRefElement e = new ScriptRefElement(isolate, ref);
+    final e = new ScriptRefElement(isolate, ref);
     document.body.append(e);
     await e.onRendered.first;
     expect(e.children.length, isNonZero, reason: 'has elements');
     expect(e.innerHtml.contains(isolate.id), isTrue,
       reason: 'no message in the component');
-    expect(e.innerHtml.contains('filename.dart'), isTrue,
+    expect(e.innerHtml.contains(file), isTrue,
       reason: 'no message in the component');
     e.remove();
     await e.onRendered.first;
     expect(e.children.length, isZero,
       reason: 'is empty');
   });
 }