Run dartfmt on all files under runtime.

runtime/observatory/tests/observatory_ui/class_tree/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/class_tree.dart';
 import 'package:observatory/src/elements/nav/notify.dart';
 import '../mocks.dart';
 
 main() {
   ClassTreeElement.tag.ensureRegistration();
 
   final nTag = NavNotifyElement.tag.name;
   const vm = const VMMock();
   const isolate = const IsolateRefMock();
   final events = new EventRepositoryMock();
   final notifications = new NotificationRepositoryMock();
 
   group('instantiation', () {
     test('default', () {
-      final e = new ClassTreeElement(vm, isolate, events, notifications,
-          new ClassRepositoryMock());
+      final e = new ClassTreeElement(
+          vm, isolate, events, notifications, new ClassRepositoryMock());
       expect(e, isNotNull, reason: 'element correctly created');
     });
   });
   group('elements', () {
     test('created after attachment', () async {
       const child2_id = 'c2-id';
       const child1_1_id = 'c1_1-id';
       const child1_id = 'c1-id';
       const child2 = const ClassMock(id: child2_id);
       const child1_1 = const ClassMock(id: child1_1_id);
-      const child1 = const ClassMock(id: child1_id,
-                                     subclasses: const [child1_1]);
-      const object = const ClassMock(id: 'o-id',
-                                     subclasses: const [child1, child2]);
+      const child1 =
+          const ClassMock(id: child1_id, subclasses: const [child1_1]);
+      const object =
+          const ClassMock(id: 'o-id', subclasses: const [child1, child2]);
       const ids = const [child1_id, child1_1_id, child2_id];
       bool rendered = false;
-      final e = new ClassTreeElement(vm, isolate, events, notifications,
+      final e = new ClassTreeElement(
+          vm,
+          isolate,
+          events,
+          notifications,
           new ClassRepositoryMock(
               object: expectAsync((i) async {
                 expect(i, equals(isolate));
                 expect(rendered, isFalse);
                 return object;
               }, count: 1),
               getter: expectAsync((i, id) async {
                 expect(i, equals(isolate));
                 expect(ids.contains(id), isTrue);
                 switch (id) {
-                  case child1_id: return child1;
-                  case child1_1_id: return child1_1;
-                  case child2_id: return child2;
-                  default: return null;
+                  case child1_id:
+                    return child1;
+                  case child1_1_id:
+                    return child1_1;
+                  case child2_id:
+                    return child2;
+                  default:
+                    return null;
                 }
               }, count: 3)));
       document.body.append(e);
       await e.onRendered.first;
       rendered = true;
       expect(e.children.length, isNonZero, reason: 'has elements');
       expect(e.querySelectorAll(nTag).length, equals(1));
       e.remove();
       await e.onRendered.first;
       expect(e.children.length, isZero, reason: 'is empty');
     });
   });
 }