test rename overhaul: step 6 - isolate tests

tests/isolate/constructor_test.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.
 
 #library("ConstructorTest");
 #import("dart:isolate");
-#import('../../../lib/unittest/unittest.dart');
+#import('../../lib/unittest/unittest.dart');
 
 class ConstructorTest extends Isolate {
   final int field;
   ConstructorTest() : super(), field = 499;
 
   void main() {
     this.port.receive((ignoredMessage, reply) {
       reply.send(field, null);
       this.port.close();
     });
   }
 }
 
 main() {
   test("constructor correctly initialized child isolate", () {
     ConstructorTest test = new ConstructorTest();
     test.spawn().then(expectAsync1((SendPort port) {
       port.call("ignored").then(expectAsync1((message) {
         Expect.equals(499, message);
       }));
     }));
   });
 }