Use scheduled_test for Pub tests.

utils/tests/pub/update/git/update_to_nonexistent_pubspec_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 '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration("updates Git packages to a nonexistent pubspec", () {
     ensureGit();
 
-    var repo = git('foo.git', [
-      libDir('foo'),
-      libPubspec('foo', '1.0.0')
+    var repo = d.git('foo.git', [
+      d.libDir('foo'),
+      d.libPubspec('foo', '1.0.0')
     ]);
-    repo.scheduleCreate();
+    repo.create();
 
-    appDir([{"git": "../foo.git"}]).scheduleCreate();
+    d.appDir([{"git": "../foo.git"}]).create();
 
     schedulePub(args: ['install'],
         output: new RegExp(r"Dependencies installed!$"));
 
-    dir(packagesPath, [
-      dir('foo', [
-        file('foo.dart', 'main() => "foo";')
+    d.dir(packagesPath, [
+      d.dir('foo', [
+        d.file('foo.dart', 'main() => "foo";')
       ])
-    ]).scheduleValidate();
+    ]).validate();
 
-    repo.scheduleGit(['rm', 'pubspec.yaml']);
-    repo.scheduleGit(['commit', '-m', 'delete']);
+    repo.runGit(['rm', 'pubspec.yaml']);
+    repo.runGit(['commit', '-m', 'delete']);
 
     schedulePub(args: ['update'],
         error: new RegExp(r'Package "foo" doesn' "'" r't have a '
             r'pubspec.yaml file.'),
         exitCode: 1);
 
-    dir(packagesPath, [
-      dir('foo', [
-        file('foo.dart', 'main() => "foo";')
+    d.dir(packagesPath, [
+      d.dir('foo', [
+        d.file('foo.dart', 'main() => "foo";')
       ])
-    ]).scheduleValidate();
+    ]).validate();
   });
 }