Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/global/activate/doesnt_snapshot_path_executables_test.dart

-// Copyright (c) 2014, 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.
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("doesn't snapshots the executables for a path package", () {
-    d.dir('foo', [
-      d.libPubspec("foo", "1.0.0"),
-      d.dir("bin", [
-        d.file("hello.dart", "void main() => print('hello!');")
-      ])
-    ]).create();
-
-    schedulePub(args: ["global", "activate", "-spath", "../foo"],
-        output: isNot(contains('Precompiled foo:hello.')));
-
-    d.dir(cachePath, [
-      d.dir('global_packages', [
-        d.dir('foo', [
-          d.matcherFile('pubspec.lock', contains('1.0.0')),
-          d.nothing('bin')
-        ])
-      ])
-    ]).validate();
-  });
-}