Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/lish/force_cannot_be_combined_with_dry_run_test.dart

-// Copyright (c) 2013, 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 '../../lib/src/exit_codes.dart' as exit_codes;
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-  setUp(d.validPackage.create);
-
-  integration('--force cannot be combined with --dry-run', () {
-    schedulePub(args: ['lish', '--force', '--dry-run'], error: """
-          Cannot use both --force and --dry-run.
-          
-          Usage: pub publish [options]
-          -h, --help       Print this usage information.
-          -n, --dry-run    Validate but do not publish the package.
-          -f, --force      Publish without confirmation if there are no errors.
-              --server     The package server to which to upload this package.
-                           (defaults to "https://pub.dartlang.org")
-
-          Run "pub help" to see global options.
-          See http://dartlang.org/tools/pub/cmd/pub-lish.html for detailed documentation.
-          """, exitCode: exit_codes.USAGE);
-  });
-}