isolates in frog: playing with API improvements

tests/isolate/src/NestedSpawnTest.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 that isolates can spawn other isolates.
 
 #library('NestedSpawnTest');
 #import('TestFramework.dart');
 
-class Isolate1 extends Isolate {
-  Isolate1() : super.heavy();
+class IsolateA extends Isolate {
+  IsolateA() : super.heavy();
 
   void main() {
     this.port.receive((msg, replyTo) {
       Expect.equals("launch nested!", msg);
-      new Isolate2().spawn().then((SendPort p) {
+      new IsolateB().spawn().then((SendPort p) {
         p.call("alive?").receive((msg, ignored) {
           Expect.equals("and kicking", msg);
           replyTo.send(499, null);
           this.port.close();
         });
       });
     });
   }
 }
 
-class Isolate2 extends Isolate {
-  Isolate2() : super.heavy();
+class IsolateB extends Isolate {
+  IsolateB() : super.heavy();
 
   void main() {
     this.port.receive((msg, replyTo) {
       Expect.equals("alive?", msg);
       replyTo.send("and kicking", null);
       this.port.close();
     });
   }
 }
 
 test(TestExpectation expect) {
-  expect.completes(new Isolate1().spawn()).then((SendPort port) {
+  expect.completes(new IsolateA().spawn()).then((SendPort port) {
     port.call("launch nested!").receive(expect.runs2((msg, ignored) {
       Expect.equals(499, msg);
       expect.succeeded();
     }));
   });
 }
 
 main() {
   runTests([test]);
 }