pkg/isolate: fix test library names and group tests

test/isolaterunner_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.
 
-library dart.pkg.isolate.isolaterunner_test;
+library isolate.test.isolaterunner_test;
 
 import 'dart:async' show Future;
 import 'dart:isolate' show Capability;
 
 import 'package:isolate/isolate_runner.dart';
 import 'package:unittest/unittest.dart';
 
 const MS = const Duration(milliseconds: 1);
 
 void main() {
   test("create-close", testCreateClose);
   test("create-run-close", testCreateRunClose);
   test("separate-isolates", testSeparateIsolates);
-  testIsolateFunctions();
+  group('isolate functions', testIsolateFunctions);
 }
 
 Future testCreateClose() {
   return IsolateRunner.spawn().then((IsolateRunner runner) {
     return runner.close();
   });
 }
 
 Future testCreateRunClose() {
   return IsolateRunner.spawn().then((IsolateRunner runner) {
@@ skipping 76 matching lines @@
       return isolate.kill();
     });
   });
 }
 
 id(x) => x;
 
 var _global;
 getGlobal(_) => _global;
 setGlobal(v) => _global = v;