isolates in frog: playing with API improvements

tests/isolate/src/APIv2_unresolvedPortsBrowserTest.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.
+
+// spawns multiple isolates and sends unresolved ports between them.
+#library('unresolved_ports');
+#import("../../../client/testing/unittest/unittest.dart");
+#import("dart:dom"); // import added so test.dart can treat this as a webtest.
+
+// This is similar as SpawnFromCodeAPIv2Test but using 'unittest.dart' so it can
+// run to completion in browsers.
+
+bethIsolate(ReceivePort port) {
+  port.receive((msg, reply) => msg[1].send(
+        "${msg[0]}\nBeth says: Tim are you coming? And Bob?", reply));
+}
+
+timIsolate(ReceivePort port) {
+  Isolate2 bob = new Isolate2.fromCode(bobIsolate);
+  port.receive((msg, reply) => bob.sendPort.send(
+        "$msg\nTim says: Can you tell 'main' that we are all coming?", reply));
+}
+
+bobIsolate(ReceivePort port) {
+  port.receive((msg, reply) => reply.send(
+        "$msg\nBob says: we are all coming!"));
+}
+
+main() {
+  asyncTest("Message chain with unresolved ports", 1, () {
+    ReceivePort port = new ReceivePort();
+    port.receive((msg, _) {
+      expect(msg).equals("main says: Beth, find out if Tim is coming."
+        + "\nBeth says: Tim are you coming? And Bob?"
+        + "\nTim says: Can you tell 'main' that we are all coming?"
+        + "\nBob says: we are all coming!");
+      port.close();
+      callbackDone();
+    });
+
+    Isolate2 tim = new Isolate2.fromCode(timIsolate);
+    Isolate2 beth = new Isolate2.fromCode(bethIsolate);
+
+    beth.sendPort.send(
+        // because tim is created asynchronously, here we are sending an
+        // unresolved port:
+        ["main says: Beth, find out if Tim is coming.", tim.sendPort],
+        port.toSendPort());
+  });
+}