Migrate test block 5 to Dart 2.0.

tests/corelib/date_time10_test.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.
-
-import "package:expect/expect.dart";
-
-// Make sure the years in the range of single digits are handled correctly with
-// month roll-over. (This tests an edge condition when delegating to
-// JavaScript's Date constructor.)
-
-void check(String expected, DateTime actual) {
-  Expect.equals(expected, actual.toString());
-}
-
-testUtc() {
-  check("0099-01-01 00:00:00.000Z", new DateTime.utc(99, 1));
-  check("0100-01-01 00:00:00.000Z", new DateTime.utc(99, 1 + 12));
-  check("0000-01-01 00:00:00.000Z", new DateTime.utc(0, 1));
-  check("-0001-01-01 00:00:00.000Z", new DateTime.utc(0, 1 - 12));
-
-  check("0099-03-02 00:00:00.000Z", new DateTime.utc(99, 2, 30));
-  check("0100-03-02 00:00:00.000Z", new DateTime.utc(99, 2 + 12, 30));
-
-  check("0004-03-01 00:00:00.000Z", new DateTime.utc(3, 2 + 12, 30));
-  check("0004-03-01 00:00:00.000Z", new DateTime.utc(4, 2, 30));
-  check("0004-03-01 00:00:00.000Z", new DateTime.utc(5, 2 - 12, 30));
-
-  check("0005-03-02 00:00:00.000Z", new DateTime.utc(4, 2 + 12, 30));
-  check("0005-03-02 00:00:00.000Z", new DateTime.utc(5, 2, 30));
-  check("0005-03-02 00:00:00.000Z", new DateTime.utc(6, 2 - 12, 30));
-}
-
-testLocal() {
-  check("0099-01-01 00:00:00.000", new DateTime(99, 1));
-  check("0100-01-01 00:00:00.000", new DateTime(99, 1 + 12));
-  check("0000-01-01 00:00:00.000", new DateTime(0, 1));
-  check("-0001-01-01 00:00:00.000", new DateTime(0, 1 - 12));
-
-  check("0099-03-02 00:00:00.000", new DateTime(99, 2, 30));
-  check("0100-03-02 00:00:00.000", new DateTime(99, 2 + 12, 30));
-
-  check("0004-03-01 00:00:00.000", new DateTime(3, 2 + 12, 30));
-  check("0004-03-01 00:00:00.000", new DateTime(4, 2, 30));
-  check("0004-03-01 00:00:00.000", new DateTime(5, 2 - 12, 30));
-
-  check("0005-03-02 00:00:00.000", new DateTime(4, 2 + 12, 30));
-  check("0005-03-02 00:00:00.000", new DateTime(5, 2, 30));
-  check("0005-03-02 00:00:00.000", new DateTime(6, 2 - 12, 30));
-}
-
-main() {
-  testUtc();
-  testLocal();
-}