add test for LibraryIdentifier within a subfolder

test/foo/bar.dart

Index: test/foo/bar.dart
diff --git a/test/bar.dart b/test/foo/bar.dart
similarity index 87%
rename from test/bar.dart
rename to test/foo/bar.dart
index dd83a8fc682408478db704b9c6a9edba9de22647..3889e3576a2ab75f337a6dd15484825872e22901 100644
--- a/test/bar.dart
+++ b/test/foo/bar.dart
@@ -2,9 +2,9 @@
 // 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.
 @initializeTracker
-library initialize.test.bar;
+library initialize.test.foo.bar;
 
-import 'foo.dart';
+import '../foo.dart';
 import 'package:initialize/src/initialize_tracker.dart';
 
 // Foo should be initialized first.