Make it easier to run engine tests

pkg/analyzer/test/parse_compilation_unit_test.dart

Index: pkg/analyzer/test/parse_compilation_unit_test.dart
diff --git a/pkg/analyzer/test/parse_compilation_unit_test.dart b/pkg/analyzer/test/parse_compilation_unit_test.dart
index 4c2ad3bac6cd462fdeb5aa5a4b70aa94833a69e3..a5bc79a59f24ec6d6ddadfed289043dfaf4005dc 100644
--- a/pkg/analyzer/test/parse_compilation_unit_test.dart
+++ b/pkg/analyzer/test/parse_compilation_unit_test.dart
@@ -2,6 +2,8 @@
 // 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.parse.compilation.unit;
+
 import 'package:analyzer/analyzer.dart';
 import 'package:unittest/unittest.dart';