Make integration tests a bit cleaner.

utils/tests/pub/install/git/check_out_transitive_test.dart

 // Copyright (c) 2012, 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 pub_tests;
 
 import 'dart:io';
 
 import '../../test_pub.dart';
-import '../../../../../pkg/unittest/lib/unittest.dart';
 
 main() {
-  test('checks out packages transitively from Git', () {
+  integration('checks out packages transitively from Git', () {
     ensureGit();
 
     git('foo.git', [
       libDir('foo'),
       libPubspec('foo', '1.0.0', [{"git": "../bar.git"}])
     ]).scheduleCreate();
 
     git('bar.git', [
       libDir('bar'),
       libPubspec('bar', '1.0.0')
@@ skipping 16 matching lines @@
     ]).scheduleValidate();
 
     dir(packagesPath, [
       dir('foo', [
         file('foo.dart', 'main() => "foo";')
       ]),
       dir('bar', [
         file('bar.dart', 'main() => "bar";')
       ])
     ]).scheduleValidate();
-
-    run();
   });
 }