Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/src/watch_manager_test.dart

 // Copyright (c) 2015, 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.
 
 library test.src.watch_manager_test;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/watch_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 import 'package:watcher/watcher.dart';
 
 import '../mocks.dart';
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(WatchManagerTest);
-  defineReflectiveTests(WatchNodeTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(WatchManagerTest);
+    defineReflectiveTests(WatchNodeTest);
+  });
 }
 
 /**
  * Tokens that can be used for testing purposes.
  */
 class Token {
   /**
    * A name used for debugging.
    */
   final String name;
@@ skipping 310 matching lines @@
   void test_insert_top() {
     WatchNode rootNode = new WatchNode(null);
     WatchNode topNode = new WatchNode(provider.getFolder('/a/b'));
 
     rootNode.insert(topNode);
     expect(rootNode.children, equals([topNode]));
     expect(topNode.parent, rootNode);
     expect(topNode.children, isEmpty);
   }
 }