Use the stack_trace library in scheduled_test.

pkg/stack_trace/test/frame_test.dart

 // Copyright (c) 2013, 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 frame_test;
 
 import 'dart:io';
 import 'dart:uri';
 
 import 'package:pathos/path.dart' as path;
@@ skipping 121 matching lines @@
     });
 
     test('just returns the library for core libraries', () {
       expect(new Frame.parse('#0 Foo (dart:core:5:10)').location,
           equals('dart:core'));
       expect(new Frame.parse('#0 Foo (dart:async-patch:1:2)').location,
           equals('dart:async-patch'));
     });
   });
 
+  group('.package', () {
+    test('returns null for non-package URIs', () {
+      expect(new Frame.parse('#0 Foo (dart:async:0:0)').package, isNull);
+      expect(new Frame.parse('#0 Foo '
+              '(http://dartlang.org/stuff/thing.dart:0:0)').package,
+          isNull);
+    });
+
+    test('returns the package name for package: URIs', () {
+      expect(new Frame.parse('#0 Foo (package:foo/foo.dart:0:0)').package,
+          equals('foo'));
+      expect(new Frame.parse('#0 Foo (package:foo/zap/bar.dart:0:0)').package,
+          equals('foo'));
+    });
+  });
+
   group('.toString()', () {
     test('returns the library and line/column numbers for non-core '
         'libraries', () {
       expect(new Frame.parse('#0 Foo (http://dartlang.org/thing.dart:5:10)')
               .toString(),
           equals('http://dartlang.org/thing.dart 5:10 in Foo'));
     });
 
     test('just returns the library for core libraries', () {
       expect(new Frame.parse('#0 Foo (dart:core:5:10)').toString(),
           equals('dart:core in Foo'));
     });
 
     test('converts "<anonymous closure>" to "<fn>"', () {
       expect(new Frame.parse('#0 Foo.<anonymous closure> (dart:core:5:10)')
               .toString(),
           equals('dart:core in Foo.<fn>'));
     });
   });
 }