Asset conversion nits (#2860)

* [asset-conv] Unused Balances type

* [asset-conv] native asset change

* Dedicated `AssetBalance` type for `pallet_assets` instances

* Improved local vs foreign asset handling + test for not allowing pool_assets in pool

* Removed `into_multiasset_id`

* Fix

* Refactor

* Fixed create_pool for benchmark with LocalAndForeignAssets (finally found it)

* ".git/.scripts/commands/fmt/fmt.sh"

* Revert

* fmt

* Migrates pools with `MultiLocation { parents: 0, interior: Here }` to `MultiLocation { parents: 1, interior: Here }`

* Allow `set_storage` for `AllowMultiAssetPools` / `LiquidityWithdrawalFee`

* Benchmarks work

* Removed comment + more defensive migration

* `T::Currency::transfer` -> `Balances::transfer_all` in migration

* Change pool_id in migration

* Update parachains/runtimes/assets/asset-hub-westend/src/lib.rs

* Bump substrate (manually)

* Bump polkadot

* Fixes from polkadot + clippy

* Fix for xcm-emulator tests (thank you Nacho)

---------

Co-authored-by: command-bot <>
Co-authored-by: Jegor Sidorenko <5252494+jsidorenko@users.noreply.github.com>

cumulus/parachains/runtimes/test-utils/src/lib.rs

@@ -37,6 +37,8 @@ use xcm::{
 };
 use xcm_executor::{traits::TransactAsset, Assets};
 
+pub mod test_cases;
+
 pub type BalanceOf<Runtime> = <Runtime as pallet_balances::Config>::Balance;
 pub type AccountIdOf<Runtime> = <Runtime as frame_system::Config>::AccountId;
 pub type ValidatorIdOf<Runtime> = <Runtime as pallet_session::Config>::ValidatorId;

cumulus/parachains/runtimes/test-utils/src/test_cases.rs

@@ -0,0 +1,91 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// This file is part of Cumulus.
+
+// Cumulus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Cumulus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Cumulus.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Module contains predefined test-case scenarios for `Runtime` with common functionality.
+
+use crate::{AccountIdOf, CollatorSessionKeys, ExtBuilder, RuntimeHelper, ValidatorIdOf};
+use codec::Encode;
+use frame_support::{assert_ok, traits::Get};
+
+/// Test-case makes sure that `Runtime` can change storage constant via governance-like call
+pub fn change_storage_constant_by_governance_works<Runtime, StorageConstant, StorageConstantType>(
+	collator_session_key: CollatorSessionKeys<Runtime>,
+	runtime_para_id: u32,
+	runtime_call_encode: Box<dyn Fn(frame_system::Call<Runtime>) -> Vec<u8>>,
+	storage_constant_key_value: fn() -> (Vec<u8>, StorageConstantType),
+	new_storage_constant_value: fn(&StorageConstantType) -> StorageConstantType,
+) where
+	Runtime: frame_system::Config
+		+ pallet_balances::Config
+		+ pallet_session::Config
+		+ pallet_xcm::Config
+		+ parachain_info::Config
+		+ pallet_collator_selection::Config
+		+ cumulus_pallet_dmp_queue::Config
+		+ cumulus_pallet_parachain_system::Config,
+	ValidatorIdOf<Runtime>: From<AccountIdOf<Runtime>>,
+	StorageConstant: Get<StorageConstantType>,
+	StorageConstantType: Encode + PartialEq + std::fmt::Debug,
+{
+	ExtBuilder::<Runtime>::default()
+		.with_collators(collator_session_key.collators())
+		.with_session_keys(collator_session_key.session_keys())
+		.with_para_id(runtime_para_id.into())
+		.with_tracing()
+		.build()
+		.execute_with(|| {
+			let (storage_constant_key, storage_constant_init_value): (
+				Vec<u8>,
+				StorageConstantType,
+			) = storage_constant_key_value();
+
+			// check delivery reward constant before (not stored yet, just as default value is used)
+			assert_eq!(StorageConstant::get(), storage_constant_init_value);
+			assert_eq!(sp_io::storage::get(&storage_constant_key), None);
+
+			let new_storage_constant_value =
+				new_storage_constant_value(&storage_constant_init_value);
+			assert_ne!(new_storage_constant_value, storage_constant_init_value);
+
+			// encode `set_storage` call
+			let set_storage_call =
+				runtime_call_encode(frame_system::Call::<Runtime>::set_storage {
+					items: vec![(
+						storage_constant_key.clone(),
+						new_storage_constant_value.encode(),
+					)],
+				});
+
+			// estimate - storing just 1 value
+			use frame_system::WeightInfo;
+			let require_weight_at_most =
+				<Runtime as frame_system::Config>::SystemWeightInfo::set_storage(1);
+
+			// execute XCM with Transact to `set_storage` as governance does
+			assert_ok!(RuntimeHelper::<Runtime>::execute_as_governance(
+				set_storage_call,
+				require_weight_at_most
+			)
+			.ensure_complete());
+
+			// check delivery reward constant after (stored)
+			assert_eq!(StorageConstant::get(), new_storage_constant_value);
+			assert_eq!(
+				sp_io::storage::get(&storage_constant_key),
+				Some(new_storage_constant_value.encode().into())
+			);
+		})
+}