Add a tearDown function to scheduled_test.

pkg/scheduled_test/test/metatest.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.
 
 /// A test library for testing test libraries? We must go deeper.
 ///
 /// Since unit testing code tends to use a lot of global state, it can be tough
 /// to test. This library manages it by running each test case in a child
 /// isolate, then reporting the results back to the parent isolate.
 library metatest;
@@ skipping 114 matching lines @@
 
 /// The port with which the child isolate should communicate with the parent
 /// isolate.
 ///
 /// `null` in the parent isolate.
 SendPort _replyTo;
 
 /// Whether or not we're running in a child isolate that's supposed to run a
 /// test.
 bool _inChildIsolate;
+bool get inChildIsolate => _inChildIsolate;
 
 /// Initialize metatest.
 ///
 /// [message] should be the second argument to [main]. It's used to determine
 /// whether this test is in the parent isolate or a child isolate.
 void initMetatest(message) {
   if (message == null) {
     _inChildIsolate = false;
   } else {
     _testToRun = message['testToRun'];
@@ skipping 86 matching lines @@
       "uncaughtError": uncaughtError,
       "results": results.map((testCase) => {
         "description": testCase.description,
         "message": testCase.message,
         "result": testCase.result,
         "stackTrace": testCase.stackTrace.toString()
       }).toList()
     });
   }
 }