Support directories other than "web" in pub build.

sdk/lib/_internal/pub/test/build/all_with_no_buildable_directories_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.",
-        exitCode: exit_codes.USAGE);
+  integration("build --all with no buildable directories", () {
+    d.appDir().create();
+
+    schedulePub(args: ["build", "--all"],
+        error: 'There are no buildable directories.\n'
+               'The supported directories are "benchmark", "bin", "example", '
+               '"test" and "web".',
+        exitCode: exit_codes.DATA);
   });
 }