tests.rs

				controllers.push(ctlr);
			}

			// When:
			let bounded_controllers: BoundedVec<
				_,
				<Test as Config>::MaxControllersInDeprecationBatch,
			> = BoundedVec::try_from(controllers.clone()).unwrap();

			let result =
				Staking::deprecate_controller_batch(RuntimeOrigin::root(), bounded_controllers);
			assert_ok!(result);
			assert_eq!(
				result.unwrap().actual_weight.unwrap(),
				<Test as Config>::WeightInfo::deprecate_controller_batch(controllers.len() as u32)
			);

			// Then:

			for n in start..(start + MaxControllersInDeprecationBatch::get()).into() {
				let unique_pair = n % 2 == 0;
				let ctlr: u64 = n.into();
				let stash: u64 = if unique_pair { (n + 10000).into() } else { ctlr };

				// Side effect of migration for unique pair.
				if unique_pair {
					assert_eq!(Ledger::<Test>::get(ctlr), None);
				}
				// Bonded maps to the stash.
				assert_eq!(Bonded::<Test>::get(stash), Some(stash));

				// Ledger is keyed by stash.
				let ledger_updated = Ledger::<Test>::get(stash).unwrap();
				assert_eq!(ledger_updated.stash, stash);
			}
		})
	}

	#[test]
	fn deprecate_controller_batch_skips_unmigrated_controller_payees() {
		ExtBuilder::default().try_state(false).build_and_execute(|| {
			// Given:

			let stash: u64 = 1000;
			let ctlr: u64 = 1001;

			Ledger::<Test>::insert(
				ctlr,
				StakingLedger { controller: None, ..StakingLedger::default_from(stash) },
			);
			Bonded::<Test>::insert(stash, ctlr);
			#[allow(deprecated)]
			Payee::<Test>::insert(stash, RewardDestination::Controller);

			// When:

			let bounded_controllers: BoundedVec<
				_,
				<Test as Config>::MaxControllersInDeprecationBatch,
			> = BoundedVec::try_from(vec![ctlr]).unwrap();

			let result =
				Staking::deprecate_controller_batch(RuntimeOrigin::root(), bounded_controllers);
			assert_ok!(result);
			assert_eq!(
				result.unwrap().actual_weight.unwrap(),
				<Test as Config>::WeightInfo::deprecate_controller_batch(1 as u32)
			);

			// Then:

			// Esure deprecation did not happen.
			assert_eq!(Ledger::<Test>::get(ctlr).is_some(), true);

			// Bonded still keyed by controller.
			assert_eq!(Bonded::<Test>::get(stash), Some(ctlr));

			// Ledger is still keyed by controller.
			let ledger_updated = Ledger::<Test>::get(ctlr).unwrap();
			assert_eq!(ledger_updated.stash, stash);
		})
	}
}