pkg/isolate: fix test library names and group tests

test/isolaterunner_test.dart

Index: test/isolaterunner_test.dart
diff --git a/test/isolaterunner_test.dart b/test/isolaterunner_test.dart
index 9183d7e499b12ef5ee5daa380c3376d3717d6a5f..ec8c7e226f186d2de556b18e006def1dc7e77fd0 100644
--- a/test/isolaterunner_test.dart
+++ b/test/isolaterunner_test.dart
@@ -2,7 +2,7 @@
 // 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;
@@ -16,7 +16,7 @@ void main() {
   test("create-close", testCreateClose);
   test("create-run-close", testCreateRunClose);
   test("separate-isolates", testSeparateIsolates);
-  testIsolateFunctions();
+  group('isolate functions', testIsolateFunctions);
 }
 
 Future testCreateClose() {