Make sure package names are URL encoded.

utils/tests/pub/install/hosted/install_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 '../../test_pub.dart';
 
 main() {
+  initConfig();
   integration('installs a package from a pub server', () {
     servePackages([package("foo", "1.2.3")]);
 
     appDir([dependency("foo", "1.2.3")]).scheduleCreate();
 
     schedulePub(args: ['install'],
         output: new RegExp("Dependencies installed!\$"));
 
     cacheDir({"foo": "1.2.3"}).scheduleValidate();
     packagesDir({"foo": "1.2.3"}).scheduleValidate();
   });
+
+  integration('URL encodes the package name', () {
+    servePackages([]);
+
+    appDir([dependency("bad name!", "1.2.3")]).scheduleCreate();
+
+    schedulePub(args: ['install'],
+        error: new RegExp('Could not find package "bad name!" at '
+                          'http://localhost:'),
+        exitCode: 1);
+  });
 }