Migrate first block of tests in standalone to standalone_2

tests/standalone_2/assert_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.
 // VMOptions=--enable_asserts
 
 // Dart test program testing assert statements.
 
 import "package:expect/expect.dart";
 
 class AssertTest {
@@ skipping 21 matching lines @@
 
   static testMain() {
     test();
     testClosure();
   }
 }
 
 main() {
   AssertTest.testMain();
 }