Missed test data file.

Author: pq

test/rules/unnecessary_brace_in_string_interp.dart

@@ -0,0 +1,10 @@
+// Copyright (c) 2015, 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.
+
+main(args) {
+  print('hello');
+  print('hello $args');
+  print('hello ${args}'); //LINT
+  print('hello ${args.length}');
+}