Revert "unittest step 3 and 4: remove TestFramework.dart, make test.dart use"

tests/isolate/src/APIv2_spawnStandaloneNegativeTest.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.
 
 // Negative test to make sure that we are reaching all assertions.
 #library('spawn_tests');
 #import('dart:isolate');
-#import('../../../lib/unittest/unittest.dart');
 
 child() {
   port.receive((msg, reply) => reply.send('re: $msg'));
 }
 
 main() {
-  test('message - reply chain', () {
-    ReceivePort port = new ReceivePort();
-    port.receive(expectAsync2((msg, _) {
-      port.close();
-      expect(msg).equals('re: hello'); // should be hi, not hello
-    }));
+  ReceivePort port = new ReceivePort();
+  port.receive((msg, _) {
+    Expect.equals('re: hello', msg); // should be hi, not hello
+    port.close();
+  });
 
-    SendPort s = spawnFunction(child);
-    s.send('hi', port.toSendPort());
-  });
+  SendPort s = spawnFunction(child);
+  s.send('hi', port.toSendPort());
 }