isolates in frog: playing with API improvements

tests/isolate/src/APIv2_unresolvedPortsStandaloneTest.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');
+
+// This test does the following:
+//  - main spawns two isolates: 'tim' and 'beth'
+//  - 'tim' spawns an isolate: 'bob'
+//  - main starts a message chain:
+//       main -> beth -> tim -> bob -> main
+//    by giving 'beth' a send-port to 'tim'.
+
+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() {
+  ReceivePort port = new ReceivePort();
+  port.receive((msg, _) {
+    Expect.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!", msg);
+    port.close();
+  });
+
+  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());
+}