First stab at "pub run" command.

sdk/lib/_internal/pub/test/pub_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.
 
 library pub_tests;
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../lib/src/exit_codes.dart' as exit_codes;
 import 'test_pub.dart';
@@ skipping 16 matching lines @@
 
     -v, --verbose         Shortcut for "--verbosity=all".
 
     Available commands:
       build      Apply transformers to build a package.
       cache      Work with the system cache.
       deps       Print package dependencies.
       get        Get the current package's dependencies.
       help       Display help information for Pub.
       publish    Publish the current package to pub.dartlang.org.
+      run        Run an executable from a package.
       serve      Run a local web development server.
       upgrade    Upgrade the current package's dependencies to latest versions.
       uploader   Manage uploaders for a package on pub.dartlang.org.
       version    Print pub version.
 
     Use "pub help [command]" for more information about a command.
     """;
 
 final VERSION_STRING = '''
     Pub 0.1.2+3
@@ skipping 61 matching lines @@
         error: '''
         Could not find a command named "quylthulg".
 
         Available commands:
           build      Apply transformers to build a package.
           cache      Work with the system cache.
           deps       Print package dependencies.
           get        Get the current package's dependencies.
           help       Display help information for Pub.
           publish    Publish the current package to pub.dartlang.org.
+          run        Run an executable from a package.
           serve      Run a local web development server.
           upgrade    Upgrade the current package's dependencies to latest versions.
           uploader   Manage uploaders for a package on pub.dartlang.org.
           version    Print pub version.
         ''',
         exitCode: exit_codes.USAGE);
   });
 
   integration('an unknown subcommand displays an error message', () {
     schedulePub(args: ['cache', 'quylthulg'],
@@ skipping 128 matching lines @@
           error: '''
             Could not find a command named "quylthulg".
 
             Available commands:
               build      Apply transformers to build a package.
               cache      Work with the system cache.
               deps       Print package dependencies.
               get        Get the current package's dependencies.
               help       Display help information for Pub.
               publish    Publish the current package to pub.dartlang.org.
+              run        Run an executable from a package.
               serve      Run a local web development server.
               upgrade    Upgrade the current package's dependencies to latest versions.
               uploader   Manage uploaders for a package on pub.dartlang.org.
               version    Print pub version.
             ''',
             exitCode: exit_codes.USAGE);
     });
 
     integration('an unknown help subcommand displays an error message', () {
       schedulePub(args: ['help', 'cache', 'quylthulg'],
@@ skipping 21 matching lines @@
             exitCode: exit_codes.USAGE);
     });
   });
 
   group('version', () {
     integration('displays the current version', () {
       schedulePub(args: ['version'], output: VERSION_STRING);
     });
   });
 }