Add a fourth test case.

#define NS_SUBMODULE ASPECT(resolve_impl, malformed_ptr)

/** Given that address is a malformed PTR name, we want dns_resolve_impl to

 * fail.

 */

static int

NS(router_my_exit_policy_is_reject_star)(void)

{

  return 0;

}

static void

NS(test_main)(void *arg)

{

  tt_skip();

  int retval;

  int made_pending;

  edge_connection_t *exitconn = create_valid_exitconn();

  or_circuit_t *on_circ = tor_malloc_zero(sizeof(or_circuit_t));

  TO_CONN(exitconn)->address = tor_strdup("127.0.0.1.in-addr.arpa");

  NS_MOCK(router_my_exit_policy_is_reject_star);

  retval = dns_resolve_impl(exitconn, 1, on_circ, NULL, &made_pending,

                            NULL);

  tt_int_op(retval,==,-1);

  tor_free(TO_CONN(exitconn)->address);

  TO_CONN(exitconn)->address =

  tor_strdup("z01234567890123456789.in-addr.arpa");

  retval = dns_resolve_impl(exitconn, 1, on_circ, NULL, &made_pending,

                            NULL);

  tt_int_op(retval,==,-1);

  done:

  NS_UNMOCK(router_my_exit_policy_is_reject_star);

  tor_free(TO_CONN(exitconn)->address);

  tor_free(exitconn);

  tor_free(on_circ);

  return;

}