work around remove deps test failure

test/dependency_graph_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 ddc.test.dependency_graph_test;
 
 import 'package:unittest/compact_vm_config.dart';
 import 'package:unittest/unittest.dart';
 
 import 'package:dev_compiler/src/checker/dart_sdk.dart'
@@ skipping 31 matching lines @@
         library a2;
         import 'a3.dart';
         import 'a4.dart';
         export 'a5.dart';
         part 'a6.dart';
       ''',
     '/a3.dart': 'library a3;',
     '/a4.dart': 'library a4; export "a10.dart";',
     '/a5.dart': 'library a5;',
     '/a6.dart': 'part of a2;',
+    '/a7.dart': 'library a7;',
     '/a8.dart': 'library a8; import "a8.dart";',
     '/a9.dart': 'library a9; import "a8.dart";',
     '/a10.dart': 'library a10;',
   };
 
   nodeOf(String filepath, [bool isPart = false]) =>
       graph.nodeFromUri(new Uri.file(filepath), isPart);
 
   setUp(() {
     /// We completely reset the TestUriResolver to avoid interference between
@@ skipping 118 matching lines @@
       expect(node.imports.length, 2);
       expect(node.exports.length, 1);
       expect(node.parts.length, 1);
       expect(node.imports.contains(nodeOf('/a3.dart')), isTrue);
       expect(node.imports.contains(nodeOf('/a4.dart')), isTrue);
       expect(node.exports.contains(nodeOf('/a5.dart')), isTrue);
       expect(node.parts.contains(nodeOf('/a6.dart')), isTrue);
 
       node.source.contents.modificationTime++;
       node.source.contents.data =
-          'import "a3.dart"; export "a6.dart"; part "a8.dart";';
+          'import "a3.dart"; export "a7.dart"; part "a8.dart";';
       node.update(graph);
 
       expect(node.imports.length, 1);
       expect(node.exports.length, 1);
       expect(node.parts.length, 1);
       expect(node.imports.contains(nodeOf('/a3.dart')), isTrue);
-      expect(node.exports.contains(nodeOf('/a6.dart')), isTrue);
+      expect(node.exports.contains(nodeOf('/a7.dart')), isTrue);
       expect(node.parts.contains(nodeOf('/a8.dart')), isTrue);
     });
   });
 
   group('local changes', () {
     group('needs rebuild', () {
       test('in HTML', () {
         var node = nodeOf('/index1.html');
         node.update(graph);
         expect(node.needsRebuild, isTrue);
@@ skipping 533 matching lines @@
       ..write(n.needsRebuild ? '[needs-rebuild] ' : '')
       ..write(n.structureChanged ? '[structure-changed] ' : ' ')
       ..write('\n');
     n.directDeps.forEach((e) => helper(e, indent: indent + 1));
   }
   helper(node);
   return sb.toString();
 }
 
 bool _same(Set a, Set b) => a.length == b.length && a.containsAll(b);