Very simple version of Isolates.

tests/isolate/message_stream_test.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.
-
-// Dart test program for testing serialization of messages.
-// VMOptions=--enable_type_checks --enable_asserts
-
-library MessageTest;
-import 'dart:isolate';
-import '../../pkg/unittest/lib/unittest.dart';
-
-// ---------------------------------------------------------------------------
-// Message passing test.
-// ---------------------------------------------------------------------------
-
-class MessageTest {
-  static const List list1 = const ["Hello", "World", "Hello", 0xfffffffffff];
-  static const List list2 = const [null, list1, list1, list1, list1];
-  static const List list3 = const [list2, 2.0, true, false, 0xfffffffffff];
-  static const Map map1 = const {
-    "a=1" : 1, "b=2" : 2, "c=3" : 3,
-  };
-  static const Map map2 = const {
-    "list1" : list1, "list2" : list2, "list3" : list3,
-  };
-  static const List list4 = const [map1, map2];
-  static const List elms = const [
-      list1, list2, list3, list4,
-  ];
-
-  static void VerifyMap(Map expected, Map actual) {
-    expect(expected, isMap);
-    expect(actual,  isMap);
-    expect(actual.length, expected.length);
-    testForEachMap(key, value) {
-      if (value is List) {
-        VerifyList(value, actual[key]);
-      } else {
-        expect(actual[key], value);
-      }
-    }
-    expected.forEach(testForEachMap);
-  }
-
-  static void VerifyList(List expected, List actual) {
-    for (int i = 0; i < expected.length; i++) {
-      if (expected[i] is List) {
-        VerifyList(expected[i], actual[i]);
-      } else if (expected[i] is Map) {
-        VerifyMap(expected[i], actual[i]);
-      } else {
-        expect(actual[i], expected[i]);
-      }
-    }
-  }
-
-  static void VerifyObject(int index, var actual) {
-    var expected = elms[index];
-    expect(expected, isList);
-    expect(actual, isList);
-    expect(actual.length, expected.length);
-    VerifyList(expected, actual);
-  }
-}
-
-pingPong() {
-  int count = 0;
-  bool isFirst = true;
-  IsolateSink replyTo;
-  stream.listen((var message) {
-    if (isFirst) {
-      isFirst = false;
-      replyTo = message;
-      return;
-    }
-    // Check if the received object is correct.
-    if (count < MessageTest.elms.length) {
-      MessageTest.VerifyObject(count, message);
-    }
-    // Bounce the received object back so that the sender
-    // can make sure that the object matches.
-    replyTo.add(message);
-    count++;
-  }, onDone: () {
-    replyTo.add(count);
-    replyTo.close();
-  });
-}
-
-main() {
-  test("send objects and receive them back", () {
-    IsolateSink remote = streamSpawnFunction(pingPong);
-    MessageBox box = new MessageBox();
-    remote.add(box.sink);
-
-    // Send objects and receive them back.
-    for (int i = 0; i < MessageTest.elms.length; i++) {
-      var sentObject = MessageTest.elms[i];
-      // TODO(asiva): remove this local var idx once thew new for-loop
-      // semantics for closures is implemented.
-      var idx = i;
-      remote.add(sentObject);
-    }
-
-    // Send recursive objects and receive them back.
-    List local_list1 = ["Hello", "World", "Hello", 0xffffffffff];
-    List local_list2 = [null, local_list1, local_list1 ];
-    List local_list3 = [local_list2, 2.0, true, false, 0xffffffffff];
-    List sendObject = new List(5);
-    sendObject[0] = local_list1;
-    sendObject[1] = sendObject;
-    sendObject[2] = local_list2;
-    sendObject[3] = sendObject;
-    sendObject[4] = local_list3;
-    remote.add(sendObject);
-
-    // Shutdown the MessageServer.
-    remote.close();
-
-    int receivedCounter = 0;
-    box.stream.listen((message) {
-      if (receivedCounter < MessageTest.elms.length) {
-        MessageTest.VerifyObject(receivedCounter, message);
-      } else if (receivedCounter == MessageTest.elms.length) {
-        var replyObject = message;
-        expect(sendObject, isList);
-        expect(replyObject, isList);
-        expect(sendObject.length, equals(replyObject.length));
-        expect(replyObject[1], same(replyObject));
-        expect(replyObject[3], same(replyObject));
-        expect(replyObject[0], same(replyObject[2][1]));
-        expect(replyObject[0], same(replyObject[2][2]));
-        expect(replyObject[2], same(replyObject[4][0]));
-        expect(replyObject[0][0], same(replyObject[0][2]));
-        // Bigint literals are not canonicalized so do a == check.
-        expect(replyObject[0][3], equals(replyObject[4][4]));
-      } else {
-        // Reply from done.
-        expect(message, MessageTest.elms.length + 1);
-      }
-      receivedCounter++;
-    });
-  });
-}