First stab at "pub run" command.

sdk/lib/_internal/pub/test/run/passes_along_arguments_test.dart

+// Copyright (c) 2014, 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 '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+
+const SCRIPT = """
+main(List<String> args) {
+  print(args.join(" "));
+}
+""";
+
+main() {
+  initConfig();
+  integration('passes arguments to the spawned script', () {
+    d.dir(appPath, [
+      d.appPubspec(),
+      d.dir("bin", [
+        d.file("args.dart", SCRIPT)
+      ])
+    ]).create();
+
+    // Use some args that would trip up pub's arg parser to ensure that it
+    // isn't trying to look at them.
+    var pub = pubRun(args: ["args", "--verbose", "-m", "--", "help"]);
+
+    pub.stdout.expect("--verbose -m -- help");
+    pub.shouldExit();
+  });
+}