Rationalize arg handling for pub build and serve.

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

Index: sdk/lib/_internal/pub/test/barback/fails_if_dir_outside_package_test.dart
diff --git a/sdk/lib/_internal/pub/test/barback/fails_if_dir_outside_package_test.dart b/sdk/lib/_internal/pub/test/barback/fails_if_dir_outside_package_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7e662187e44c21dffc62e7c28bc6873ea49317bf
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/barback/fails_if_dir_outside_package_test.dart
@@ -0,0 +1,23 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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("if source directory reaches outside the package",
+      args: [".."],
+      error: 'Directory ".." isn\'t in this package.',
+      exitCode: exit_codes.USAGE);
+}