Add tests for bug with inheriting ns.
Add tests for bug with inheriting ns.

hanshuebner/jing-trang,dmj/jing-trang,brand/jing-trang,dmj/jing-trang,brand/jing-trang,brand/jing-trang,hanshuebner/jing-trang,dmj/jing-trang,hanshuebner/jing-trang