Added test implementation of url_for.
Added test implementation of url_for.

RitwikGupta/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,cganas/picoCTF-shell-manager,cganas/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,cganas/picoCTF-shell-manager,cganas/picoCTF-shell-manager