Add corelib tests

test/codegen/corelib/reg_exp_groups_test.dart

Index: test/codegen/corelib/reg_exp_groups_test.dart
diff --git a/test/codegen/corelib/reg_exp_groups_test.dart b/test/codegen/corelib/reg_exp_groups_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..70386d0e9ecea23c420cf15623e656f58b207d1e
--- /dev/null
+++ b/test/codegen/corelib/reg_exp_groups_test.dart
@@ -0,0 +1,22 @@
+// 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.
+
+import "package:expect/expect.dart";
+
+// Dart test program for RegExp.groups.
+
+class RegExpGroupsTest {
+  static testMain() {
+    var match = new RegExp("(a(b)((c|de)+))").firstMatch("abcde");
+    var groups = match.groups([0, 4, 2, 3]);
+    Expect.equals('abcde', groups[0]);
+    Expect.equals('de', groups[1]);
+    Expect.equals('b', groups[2]);
+    Expect.equals('cde', groups[3]);
+  }
+}
+
+main() {
+  RegExpGroupsTest.testMain();
+}