Make sure package names are URL encoded.

utils/tests/pub/validator_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 validator_test;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as json;
 import 'dart:math' as math;
@@ skipping 266 matching lines @@
       expectValidationError(license);
     });
 
     integration('has an empty package name', () {
       dir(appPath, [libPubspec("", "1.0.0")]).scheduleCreate();
       expectValidationError(name);
     });
 
     integration('has a package name with an invalid character', () {
       dir(appPath, [libPubspec("test-pkg", "1.0.0")]).scheduleCreate();
-      expectValidationWarning(name);
+      expectValidationError(name);
     });
 
     integration('has a package name that begins with a number', () {
       dir(appPath, [libPubspec("8ball", "1.0.0")]).scheduleCreate();
-      expectValidationWarning(name);
+      expectValidationError(name);
     });
 
     integration('has a package name that contains upper-case letters', () {
       dir(appPath, [libPubspec("TestPkg", "1.0.0")]).scheduleCreate();
       expectValidationWarning(name);
     });
 
     integration('has a package name that is a Dart reserved word', () {
       dir(appPath, [libPubspec("final", "1.0.0")]).scheduleCreate();
       expectValidationError(name);
@@ skipping 273 matching lines @@
     });
 
     test('has a README with invalid utf-8', () {
       dir(appPath, [
         binaryFile("README", [192])
       ]).scheduleCreate();
       expectValidationWarning(utf8Readme);
     });
   });
 }