Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/upgrade/git/upgrade_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 '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("upgrades Git packages to a nonexistent pubspec", () {
-    ensureGit();
-
-    var repo = d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0')
-    ]);
-    repo.create();
-
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
-
-    pubGet();
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
-
-    repo.runGit(['rm', 'pubspec.yaml']);
-    repo.runGit(['commit', '-m', 'delete']);
-
-    pubUpgrade(error: new RegExp(r'Could not find a file named "pubspec.yaml" '
-        r'in "[^\n]*"\.'));
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
-  });
-}