Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/get/git/stay_locked_if_compatible_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("doesn't upgrade a locked Git package with a new compatible "
-      "constraint", () {
-    ensureGit();
-
-    d.git('foo.git', [
-      d.libDir('foo', 'foo 1.0.0'),
-      d.libPubspec("foo", "1.0.0")
-    ]).create();
-
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
-
-    pubGet();
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo 1.0.0";')
-      ])
-    ]).validate();
-
-    d.git('foo.git', [
-      d.libDir('foo', 'foo 1.0.1'),
-      d.libPubspec("foo", "1.0.1")
-    ]).commit();
-
-    d.appDir({"foo": {"git": "../foo.git", "version": ">=1.0.0"}}).create();
-
-    pubGet();
-
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo 1.0.0";')
-      ])
-    ]).validate();
-  });
-}