Add corelib tests

test/codegen/corelib/list_literal_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.
+
+import "package:expect/expect.dart";
+
+// Test that a list literal is expandable and modifiable.
+
+class ListLiteralTest {
+
+  static void testMain() {
+    var list = [1, 2, 3];
+    Expect.equals(3, list.length);
+    list.add(4);
+    Expect.equals(4, list.length);
+    list.addAll([5, 6]);
+    Expect.equals(6, list.length);
+    list[0] = 0;
+    Expect.equals(0, list[0]);
+  }
+}
+
+main() {
+  ListLiteralTest.testMain();
+}