Update charted to 0.4.8 and roll

packages/args/test/utils.dart

 // Copyright (c) 2013, 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 utils;
-
 import 'dart:async';
 
 import 'package:args/args.dart';
 import 'package:args/command_runner.dart';
 import 'package:test/test.dart';
 
 class CommandRunnerWithFooter extends CommandRunner {
-  final usageFooter = "Also, footer!";
+  String get usageFooter => "Also, footer!";
 
   CommandRunnerWithFooter(String executableName, String description)
       : super(executableName, description);
 }
 
 class FooCommand extends Command {
   var hasRun = false;
 
   final name = "foo";
   final description = "Set a value.";
   final takesArguments = false;
 
   void run() {
     hasRun = true;
   }
 }
 
+class ValueCommand extends Command<int> {
+  final name = "foo";
+  final description = "Return a value.";
+  final takesArguments = false;
+
+  int run() => 12;
+}
+
+class AsyncValueCommand extends Command<String> {
+  final name = "foo";
+  final description = "Return a future.";
+  final takesArguments = false;
+
+  Future<String> run() async => "hi";
+}
+
+class MultilineCommand extends Command {
+  var hasRun = false;
+
+  final name = "multiline";
+  final description = "Multi\nline.";
+  final takesArguments = false;
+
+  void run() {
+    hasRun = true;
+  }
+}
+
+class MultilineSummaryCommand extends MultilineCommand {
+  String get summary => description;
+}
+
 class HiddenCommand extends Command {
   var hasRun = false;
 
   final name = "hidden";
   final description = "Set a value.";
   final hidden = true;
   final takesArguments = false;
 
   void run() {
     hasRun = true;
@@ skipping 24 matching lines @@
 }
 
 void throwsIllegalArg(function, {String reason: null}) {
   expect(function, throwsArgumentError, reason: reason);
 }
 
 void throwsFormat(ArgParser parser, List<String> args) {
   expect(() => parser.parse(args), throwsFormatException);
 }
 
-Matcher throwsUsageError(message, usage) {
+Matcher throwsUsageException(message, usage) {
   return throwsA(predicate((error) {
     expect(error, new isInstanceOf<UsageException>());
     expect(error.message, message);
     expect(error.usage, usage);
     return true;
   }));
 }