Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/cache/add/adds_latest_matching_version_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.
-
-library pub_tests;
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('adds the latest version of the package matching the '
-              'version constraint', () {
-    servePackages((builder) {
-      builder.serve("foo", "1.2.2");
-      builder.serve("foo", "1.2.3");
-      builder.serve("foo", "2.0.0-dev");
-      builder.serve("foo", "2.0.0");
-    });
-
-    schedulePub(args: ["cache", "add", "foo", "-v", ">=1.0.0 <2.0.0"],
-        output: 'Downloading foo 1.2.3...');
-
-    d.cacheDir({"foo": "1.2.3"}).validate();
-    d.hostedCache([
-      d.nothing("foo-1.2.2"),
-      d.nothing("foo-2.0.0-dev"),
-      d.nothing("foo-2.0.0")
-    ]).validate();
-  });
-}