Change the URL-space exposed by the browser server.

test/runner/pub_serve_test.dart

 // Copyright (c) 2015, 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.
 
 @TestOn("vm")
 
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
@@ skipping 205 matching lines @@
     });
   });
 
   test("gracefully handles pub serve not running for VM tests", () {
     var result = runUnittest(['--pub-serve=54321'],
         workingDirectory: _sandbox);
     expect(result.stdout, allOf([
       contains('-1: load error'),
       contains('''
   Failed to load "test/my_test.dart":
-  Error getting http://localhost:54321/my_test.vm_test.dart: Connection refused
+  Error getting http://localhost:54321/my_test.dart.vm_test.dart: Connection refused
   Make sure "pub serve" is running.''')
     ]));
     expect(result.exitCode, equals(1));
   });
 
   test("gracefully handles pub serve not running for browser tests", () {
     var result = runUnittest(['--pub-serve=54321', '-p', 'chrome'],
         workingDirectory: _sandbox);
     expect(result.stdout, allOf([
       contains('-1: load error'),
       contains('Failed to load "test/my_test.dart":'),
-      contains('Error getting http://localhost:54321/my_test.browser_test.dart'
-          '.js: Connection refused (errno '),
+      contains('Error getting http://localhost:54321/my_test.dart.browser_test'
+          '.dart.js: Connection refused (errno '),
       contains('Make sure "pub serve" is running.')
     ]));
     expect(result.exitCode, equals(1));
   });
 
   test("gracefully handles a test file not being in test/", () {
     new File(p.join(_sandbox, 'test/my_test.dart'))
         .copySync(p.join(_sandbox, 'my_test.dart'));
 
     var result = runUnittest(['--pub-serve=54321', 'my_test.dart'],
         workingDirectory: _sandbox);
     expect(result.stdout, allOf([
       contains('-1: load error'),
       contains(
           'Failed to load "my_test.dart": When using "pub serve", all test '
               'files must be in test/.\n')
     ]));
     expect(result.exitCode, equals(1));
   });
 }