Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/serve/gets_first_if_git_ref_changed_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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';
-import 'utils.dart';
-
-main() {
-  initConfig();
-  integration("gets first if a git dependency's ref doesn't match the one in "
-      "the lock file", () {
-    var repo = d.git('foo.git', [
-      d.libDir('foo', 'before'),
-      d.libPubspec('foo', '1.0.0')
-    ]);
-    repo.create();
-    var commit1 = repo.revParse('HEAD');
-
-    d.git('foo.git', [
-      d.libDir('foo', 'after'),
-      d.libPubspec('foo', '1.0.0')
-    ]).commit();
-
-    var commit2 = repo.revParse('HEAD');
-
-    // Lock it to the ref of the first commit.
-    d.appDir({
-      "foo": {"git": {"url": "../foo.git", "ref": commit1}}
-    }).create();
-
-    pubGet();
-
-    // Change the commit in the pubspec.
-    d.appDir({
-      "foo": {"git": {"url": "../foo.git", "ref": commit2}}
-    }).create();
-
-    pubServe(shouldGetFirst: true);
-    requestShouldSucceed("packages/foo/foo.dart", 'main() => "after";');
-    endPubServe();
-  });
-}