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

tests/isolate/src/Isolate2NegativeTest.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 exceptions in other isolates bring down
 // the program.
 
 #library('Isolate2NegativeTest');
 #import('dart:isolate');
-#import('TestFramework.dart');
+#import('../../../lib/unittest/unittest.dart');
 
 class Isolate2NegativeTest extends Isolate {
   Isolate2NegativeTest() : super();
 
   void main() {
     throw "foo";
   }
 }
 
-void test(TestExpectation expect) {
-  // We will never call 'expect.succeeded'. This test fails with a timeout.
-  expect.completes(new Isolate2NegativeTest().spawn());
+main() {
+  test("catch exception from other isolate", () {
+    // Calling 'then' ensures the test framework is aware that there is a
+    // pending callback, so it can fail quickly.
+    new Isolate2NegativeTest().spawn().then(expectAsync1((a) => null));
+  });
 }
-
-main() {
-  runTests([test]);
-}