Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/global/activate/installs_dependencies_for_path_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 'package:scheduled_test/scheduled_stream.dart';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('activating a path package installs dependencies', () {
-    servePackages((builder) {
-      builder.serve("bar", "1.0.0", deps: {
-        "baz": "any"
-      });
-      builder.serve("baz", "2.0.0");
-    });
-
-    d.dir("foo", [d.libPubspec("foo", "0.0.0", deps: {
-        "bar": "any"
-      }),
-          d.dir("bin", [d.file("foo.dart", "main() => print('ok');")])]).create();
-
-    var pub = startPub(args: ["global", "activate", "-spath", "../foo"]);
-    pub.stdout.expect(consumeThrough("Resolving dependencies..."));
-    pub.stdout.expect(consumeThrough("Downloading bar 1.0.0..."));
-    pub.stdout.expect(consumeThrough("Downloading baz 2.0.0..."));
-    pub.stdout.expect(
-        consumeThrough(startsWith("Activated foo 0.0.0 at path")));
-    pub.shouldExit();
-
-    // Puts the lockfile in the linked package itself.
-    d.dir(
-        "foo",
-        [
-            d.matcherFile(
-                "pubspec.lock",
-                allOf(
-                    [
-                        contains("bar"),
-                        contains("1.0.0"),
-                        contains("baz"),
-                        contains("2.0.0")]))]).validate();
-  });
-}