Very simple version of Isolates.

utils/testrunner/standard_test_runner.dart

 // Copyright (c) 2012, 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.
 
 part of test_controller;
 
 /** Path to DRT executable. */
 String drt;
 
 /** Whether to include elapsed time. */
@@ skipping 186 matching lines @@
 
   void onSummary(int passed, int failed, int errors,
       List<TestCase> results, String uncaughtError) {
     TestCase test = results[0];
     parentPort.send([test.result, test.runningTime.inMilliseconds,
                      test.message, test.stackTrace.toString()]);
   }
 }
 
 var parentPort;
-runChildTest() {
-  port.receive((testName, sendport) {
-    parentPort = sendport;
-    unittestConfiguration = new TestRunnerChildConfiguration();
-    groupSep = marker;
-    group('', test.main);
-    filterTests(testName);
-    runTests();
-  });
+runChildTest(message) {
+  var testName = message[0];
+  parentPort = message[1];
+  unittestConfiguration = new TestRunnerChildConfiguration();
+  groupSep = marker;
+  group('', test.main);
+  filterTests(testName);
+  runTests();
 }
 
 isolatedTestParentWrapper(testCase) => () {
-  SendPort childPort = spawnFunction(runChildTest);
-  var f = childPort.call(testCase.description);
-  f.then((results) {
+  ReceivePort response = new ReceivePort();
+  return Isolate.spawn(runChildTest, [testCase.description, response.sendPort])
+      .then((_) => response.first)
+      .then((results) {
     var result = results[0];
     var duration = new Duration(milliseconds: results[1]);
     var message = results[2];
     var stack = results[3];
     if (result == 'fail') {
       testCase.fail(message, stack);
     } else if (result == 'error') {
       testCase.error(message, stack);
     }
   });
-  return f;
 };
 
 runIsolateTests() {
   // Replace each test with a wrapped version first.
   for (var i = 0; i < testCases.length; i++) {
     testCases[i].testFunction = isolatedTestParentWrapper(testCases[i]);
   }
   runTests();
 }
 
@@ skipping 17 matching lines @@
 }
 
 process(testMain, action) {
   groupSep = marker;
   unittestConfiguration = new TestRunnerConfiguration();
   group('', testMain);
   // Do any user-specified test filtering.
   filterTests(filterTest);
   action();
 }