Show partial reports in pub get, serve, and build.

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 52 matching lines @@
   });
 
   integration('running pub with --help after command shows command usage', () {
     schedulePub(args: ['get', '--help'],
         output: '''
           Get the current package's dependencies.
 
           Usage: pub get
           -h, --help            Print usage information for this command.
               --[no-]offline    Use cached packages instead of accessing the network.
+          -n, --dry-run         Report what dependencies would change but don't change any.
     ''');
   });
 
   integration('running pub with -h after command shows command usage', () {
     schedulePub(args: ['get', '-h'],
         output: '''
           Get the current package's dependencies.
 
           Usage: pub get
           -h, --help            Print usage information for this command.
               --[no-]offline    Use cached packages instead of accessing the network.
+          -n, --dry-run         Report what dependencies would change but don't change any.
     ''');
   });
 
   integration('running pub with --help after a command with subcommands shows '
               'command usage', () {
     schedulePub(args: ['cache', '--help'],
         output: '''
           Work with the system cache.
 
           Usage: pub cache <subcommand>
@@ skipping 98 matching lines @@
     });
 
     integration('shows help for a command', () {
       schedulePub(args: ['help', 'get'],
           output: '''
             Get the current package's dependencies.
 
             Usage: pub get
             -h, --help            Print usage information for this command.
                 --[no-]offline    Use cached packages instead of accessing the network.
+            -n, --dry-run         Report what dependencies would change but don't change any.
             ''');
     });
 
     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.
@@ skipping 88 matching lines @@
             exitCode: exit_codes.USAGE);
     });
   });
 
   group('version', () {
     integration('displays the current version', () {
       schedulePub(args: ['version'], output: VERSION_STRING);
     });
   });
 }