Add corelib tests

test/codegen/corelib/date_time6_test.dart

Index: test/codegen/corelib/date_time6_test.dart
diff --git a/test/codegen/corelib/date_time6_test.dart b/test/codegen/corelib/date_time6_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c065705bafcf9e0d4286321b9a3c0218a10c2010
--- /dev/null
+++ b/test/codegen/corelib/date_time6_test.dart
@@ -0,0 +1,31 @@
+// 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";
+
+// Test DateTime comparison operators.
+
+main() {
+  var d = new DateTime.fromMillisecondsSinceEpoch(0, isUtc: true);
+  var d2 = new DateTime.fromMillisecondsSinceEpoch(1, isUtc: true);
+  Expect.isTrue(d.isBefore(d2));
+  Expect.isTrue(!d.isAfter(d2));
+  Expect.isTrue(d2.isAfter(d));
+  Expect.isTrue(!d2.isBefore(d));
+  Expect.isFalse(d2.isBefore(d));
+  Expect.isFalse(!d2.isAfter(d));
+  Expect.isFalse(d.isAfter(d2));
+  Expect.isFalse(!d.isBefore(d2));
+
+  d = new DateTime.fromMillisecondsSinceEpoch(-1, isUtc: true);
+  d2 = new DateTime.fromMillisecondsSinceEpoch(0, isUtc: true);
+  Expect.isTrue(d.isBefore(d2));
+  Expect.isTrue(!d.isAfter(d2));
+  Expect.isTrue(d2.isAfter(d));
+  Expect.isTrue(!d2.isBefore(d));
+  Expect.isFalse(d2.isBefore(d));
+  Expect.isFalse(!d2.isAfter(d));
+  Expect.isFalse(d.isAfter(d2));
+  Expect.isFalse(!d.isBefore(d2));
+}