Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/get/git/check_out_and_upgrade_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 'package:scheduled_test/scheduled_test.dart';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('checks out and upgrades a package from Git', () {
-    ensureGit();
-
-    d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0')
-    ]).create();
-
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
-
-    pubGet();
-
-    d.dir(cachePath, [
-      d.dir('git', [
-        d.dir('cache', [d.gitPackageRepoCacheDir('foo')]),
-        d.gitPackageRevisionCacheDir('foo')
-      ])
-    ]).validate();
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
-
-    d.git('foo.git', [
-      d.libDir('foo', 'foo 2'),
-      d.libPubspec('foo', '1.0.0')
-    ]).commit();
-
-    pubUpgrade(output: contains("Changed 1 dependency!"));
-
-    // When we download a new version of the git package, we should re-use the
-    // git/cache directory but create a new git/ directory.
-    d.dir(cachePath, [
-      d.dir('git', [
-        d.dir('cache', [d.gitPackageRepoCacheDir('foo')]),
-        d.gitPackageRevisionCacheDir('foo'),
-        d.gitPackageRevisionCacheDir('foo', 2)
-      ])
-    ]).validate();
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo 2";')
-      ])
-    ]).validate();
-  });
-}