Use args' command support for pub commands.

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 'dart:io';
 
 import 'package:scheduled_test/scheduled_test.dart';
 
@@ skipping 43 matching lines @@
   });
 
   integration('running pub with just --help displays usage', () {
     schedulePub(args: ['--help'], output: USAGE_STRING);
   });
 
   integration('running pub with just -h displays usage', () {
     schedulePub(args: ['-h'], output: USAGE_STRING);
   });
 
+  integration('running pub with --help after command shows command usage', () {
+    schedulePub(args: ['install', '--help'],
+        output: '''
+          Install the current package's dependencies.
+
+          Usage: pub install
+          -h, --help            Print usage information for this command.
+              --[no-]offline    Use cached packages instead of accessing the network.
+    ''');
+  });
+
+  integration('running pub with -h after command shows command usage', () {
+    schedulePub(args: ['install', '-h'],
+        output: '''
+          Install the current package's dependencies.
+
+          Usage: pub install
+          -h, --help            Print usage information for this command.
+              --[no-]offline    Use cached packages instead of accessing the network.
+    ''');
+  });
+
   integration('running pub with just --version displays version', () {
     schedulePub(args: ['--version'], output: VERSION_STRING);
   });
 
   integration('an unknown command displays an error message', () {
     schedulePub(args: ['quylthulg'],
         error: '''
         Could not find a command named "quylthulg".
         Run "pub help" to see available commands.
         ''',
         exitCode: 64);
   });
 
   integration('an unknown option displays an error message', () {
     schedulePub(args: ['--blorf'],
         error: '''
         Could not find an option named "blorf".
         Run "pub help" to see available options.
         ''',
         exitCode: 64);
   });
 
   integration('an unknown command option displays an error message', () {
     // TODO(rnystrom): When pub has command-specific options, a more precise
     // error message would be good here.
     schedulePub(args: ['version', '--blorf'],
         error: '''
         Could not find an option named "blorf".
-        Use "pub help" for more information.
+        Run "pub help" to see available options.
         ''',
         exitCode: 64);
   });
 
   group('help', () {
     integration('shows help for a command', () {
       schedulePub(args: ['help', 'install'],
           output: '''
             Install the current package's dependencies.
 
             Usage: pub install
-            --[no-]offline    Use cached packages instead of accessing the network.
+            -h, --help            Print usage information for this command.
+                --[no-]offline    Use cached packages instead of accessing the network.
             ''');
     });
 
     integration('shows help for a command', () {
       schedulePub(args: ['help', 'publish'],
           output: '''
             Publish the current package to pub.dartlang.org.
 
             Usage: pub publish [options]
+            -h, --help       Print usage information for this command.
             -n, --dry-run    Validate but do not publish the package.
             -f, --force      Publish without confirmation if there are no errors.
                 --server     The package server to which to upload this package.
                              (defaults to "https://pub.dartlang.org")
             ''');
     });
 
     integration('an unknown help command displays an error message', () {
       schedulePub(args: ['help', 'quylthulg'],
           error: '''
@@ skipping 22 matching lines @@
       // The "version" file generated on developer builds is a little funky and
       // we need to make sure we don't choke on it.
       d.dir(sdkPath, [
         d.file('version', '0.1.2.0_r16279_bobross'),
       ]).create();
 
       schedulePub(args: ['version'], output: "Pub 0.1.2+0.r16279.bobross\n");
     });
   });
 }