isolates refactor: this change introduces 'dart:isolate' as a library. This is a

tests/corelib/src/PortTest.dart

-// Copyright (c) 2011, 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 properties of ports.
-
-class PortTest {
-
-  static void testMain() {
-    testHashCode();
-    testEquals();
-    testMap();
-  }
-
-  static void testHashCode() {
-    ReceivePort rp0 = new ReceivePort();
-    ReceivePort rp1 = new ReceivePort();
-    Expect.equals(rp0.toSendPort().hashCode(), rp0.toSendPort().hashCode());
-    Expect.equals(rp1.toSendPort().hashCode(), rp1.toSendPort().hashCode());
-    rp0.close();
-    rp1.close();
-  }
-
-  static void testEquals() {
-    ReceivePort rp0 = new ReceivePort();
-    ReceivePort rp1 = new ReceivePort();  
-    Expect.equals(rp0.toSendPort(), rp0.toSendPort());
-    Expect.equals(rp1.toSendPort(), rp1.toSendPort());
-    Expect.equals(false, (rp0.toSendPort() == rp1.toSendPort()));
-    rp0.close();
-    rp1.close();
-  }
-
-  static void testMap() {
-    ReceivePort rp0 = new ReceivePort();
-    ReceivePort rp1 = new ReceivePort();
-    final map = new Map<SendPort, int>();
-    map[rp0.toSendPort()] = 42;
-    map[rp1.toSendPort()] = 87;
-    Expect.equals(42, map[rp0.toSendPort()]);
-    Expect.equals(87, map[rp1.toSendPort()]);
-
-    map[rp0.toSendPort()] = 99;
-    Expect.equals(99, map[rp0.toSendPort()]);
-    Expect.equals(87, map[rp1.toSendPort()]);
-
-    map.remove(rp0.toSendPort());
-    Expect.equals(false, map.containsKey(rp0.toSendPort()));
-    Expect.equals(87, map[rp1.toSendPort()]);
-
-    map.remove(rp1.toSendPort());
-    Expect.equals(false, map.containsKey(rp0.toSendPort()));
-    Expect.equals(false, map.containsKey(rp1.toSendPort()));
-    
-    rp0.close();
-    rp1.close();
-  }
-  
-}
-
-main() {
-  PortTest.testMain();
-}