test rename overhaul: step 8 - language tests

tests/language/src/AckermannTest.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 version of two-argument Ackermann-Peter function.
-
-class AckermannTest {
-  static ack(m, n) {
-    return m == 0 ?
-        n + 1 : ((n == 0) ?
-                    ack(m - 1, 1) : ack(m - 1, ack(m, n - 1)));
-  }
-
-  static testMain() {
-    Expect.equals(253, ack(3, 5));
-  }
-}
-
-main() {
-  AckermannTest.testMain();
-}