Add mirrors tests

test/codegen/lib/mirrors/unnamed_library_test.dart

+// Copyright (c) 2013, 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.
+
+// No library declaration.
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+class Class {}
+
+main() {
+  ClassMirror cm = reflectClass(Class);
+  LibraryMirror lm = cm.owner;
+
+  Expect.equals('Class', MirrorSystem.getName(cm.simpleName));
+  Expect.equals('.Class', MirrorSystem.getName(cm.qualifiedName));
+  Expect.equals('', MirrorSystem.getName(lm.simpleName));
+  Expect.equals('', MirrorSystem.getName(lm.qualifiedName));
+}