Rationalize arg handling for pub build and serve.

sdk/lib/_internal/pub/test/barback/fails_on_all_with_no_buildable_directories_test.dart

Index: sdk/lib/_internal/pub/test/barback/fails_on_all_with_no_buildable_directories_test.dart
diff --git a/sdk/lib/_internal/pub/test/barback/fails_on_all_with_no_buildable_directories_test.dart b/sdk/lib/_internal/pub/test/barback/fails_on_all_with_no_buildable_directories_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8c0a06fa6b513c14df31389329bd5dd65b226dc9
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/barback/fails_on_all_with_no_buildable_directories_test.dart
@@ -0,0 +1,25 @@
+// 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';
+import 'utils.dart';
+
+main() {
+  initConfig();
+
+  setUp(() {
+    d.appDir().create();
+  });
+
+  pubBuildAndServeShouldFail("on --all with no default source directories",
+      args: ["--all"],
+      error: 'There are no source directories present.\n'
+        'The default directories are "benchmark", "bin", "example", '
+        '"test" and "web".',
+      exitCode: exit_codes.DATA);
+}