Import rasta tests.

pkg/fasta/test/rasta/external_factory_redirection.dart

Index: pkg/fasta/test/rasta/external_factory_redirection.dart
diff --git a/pkg/fasta/test/rasta/external_factory_redirection.dart b/pkg/fasta/test/rasta/external_factory_redirection.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3563f91a3c51918024efddf28fe7359e209ad3af
--- /dev/null
+++ b/pkg/fasta/test/rasta/external_factory_redirection.dart
@@ -0,0 +1,9 @@
+// Copyright (c) 2016, 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.md file.
+
+main() {
+  "Should redirect to LinkedHashMap constructor.";
+  new Map<Symbol, dynamic>(); // This is a patched constructor whose
+                              // implementation contains the redirection.
+}