Add mirrors tests

test/codegen/lib/mirrors/reflected_type_helper.dart

Index: test/codegen/lib/mirrors/reflected_type_helper.dart
diff --git a/test/codegen/lib/mirrors/reflected_type_helper.dart b/test/codegen/lib/mirrors/reflected_type_helper.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e973854b90555635290d80f012afa0f24f1d1536
--- /dev/null
+++ b/test/codegen/lib/mirrors/reflected_type_helper.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2014, 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.
+
+library test.reflected_type_helper;
+
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+
+expectReflectedType(TypeMirror typeMirror, Type expectedType) {
+  if (expectedType == null) {
+    Expect.isFalse(typeMirror.hasReflectedType);
+    Expect.throws(() => typeMirror.reflectedType,
+                  (e) => e is UnsupportedError,
+                  "Should not have a reflected type");
+  } else {
+    Expect.isTrue(typeMirror.hasReflectedType);
+    Expect.equals(expectedType, typeMirror.reflectedType);
+  }
+}