Start pulling pub from its own repo.

sdk/lib/_internal/pub/test/cache/repair/reinstalls_git_packages_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 'package:path/path.dart' as path;
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../../lib/src/io.dart';
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('reinstalls previously cached git packages', () {
-    // Create two cached revisions of foo.
-    d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0')
-    ]).create();
-
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
-    pubGet();
-
-    d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.1')
-    ]).commit();
-
-    pubUpgrade();
-
-    // Break them.
-    var fooDirs;
-    schedule(() {
-      // Find the cached foo packages for each revision.
-      var gitCacheDir = path.join(sandboxDir, cachePath, "git");
-      fooDirs = listDir(gitCacheDir)
-          .where((dir) => path.basename(dir).startsWith("foo-")).toList();
-
-      // Delete "foo.dart" from them.
-      for (var dir in fooDirs) {
-        deleteEntry(path.join(dir, "lib", "foo.dart"));
-      }
-    });
-
-    // Repair them.
-    schedulePub(args: ["cache", "repair"],
-        output: '''
-          Resetting Git repository for foo 1.0.0...
-          Resetting Git repository for foo 1.0.1...
-          Reinstalled 2 packages.''');
-
-    // The missing libraries should have been replaced.
-    schedule(() {
-      var fooLibs = fooDirs.map((dir) {
-        var fooDirName = path.basename(dir);
-        return d.dir(fooDirName, [
-          d.dir("lib", [d.file("foo.dart", 'main() => "foo";')])
-        ]);
-      }).toList();
-
-      d.dir(cachePath, [
-        d.dir("git", fooLibs)
-      ]).validate();
-    });
-  });
-}