More fixes for failures on the Windows bot

pkg/analysis_server/test/source/test_all.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.source;
 
+import '../utils.dart';
 import 'caching_put_package_map_provider_test.dart' as caching_provider_test;
-import 'package:unittest/unittest.dart';
 
 /// Utility for manually running all tests.
 main() {
-  groupSep = ' | ';
+  initializeTestEnvironment();
   caching_provider_test.main();
 }