Optimize work with absolute paths.

pkg/analyzer/test/src/util/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.src.util;
 
 import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
+import 'absolute_path_test.dart' as absolute_path_test;
 import 'asserts_test.dart' as asserts_test;
 import 'lru_map_test.dart' as lru_map_test;
 import 'yaml_test.dart' as yaml_test;
 
 /// Utility for manually running all tests.
 main() {
   initializeTestEnvironment();
   group('util tests', () {
+    absolute_path_test.main();
     asserts_test.main();
     lru_map_test.main();
     yaml_test.main();
   });
 }