Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/oauth2/with_an_expired_credentials_without_a_refresh_token_authenticates_again_test.dart

-// Copyright (c) 2012, 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_server.dart';
 import 'package:shelf/shelf.dart' as shelf;
-
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
-
 main() {
   initConfig();
-  integration('with a malformed credentials.json, authenticates again and '
-      'saves credentials.json', () {
+  integration(
+      'with an expired credentials.json without a refresh token, '
+          'authenticates again and saves credentials.json',
+      () {
     d.validPackage.create();
-
     var server = new ScheduledServer();
-    d.dir(cachePath, [
-      d.file('credentials.json', '{bad json')
-    ]).create();
-
+    d.credentialsFile(
+        server,
+        'access token',
+        expiration: new DateTime.now().subtract(new Duration(hours: 1))).create();
     var pub = startPublish(server);
     confirmPublish(pub);
+    pub.stderr.expect(
+        "Pub's authorization to upload packages has expired and "
+            "can't be automatically refreshed.");
     authorizePub(pub, server, "new access token");
-
     server.handle('GET', '/api/packages/versions/new', (request) {
-      expect(request.headers,
+      expect(
+          request.headers,
           containsPair('authorization', 'Bearer new access token'));
-
       return new shelf.Response(200);
     });
-
-    // After we give pub an invalid response, it should crash. We wait for it to
-    // do so rather than killing it so it'll write out the credentials file.
     pub.shouldExit(1);
-
     d.credentialsFile(server, 'new access token').validate();
   });
-}
+}