Feature gate test `benchmark_storage_works` (#6376)

* Feature gate storage bench test

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* typo

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: parity-processbot <>

polkadot/tests/benchmark_storage_works.rs

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
+#![cfg(feature = "runtime-benchmarks")]
+
 use assert_cmd::cargo::cargo_bin;
 use std::{
 	path::Path,