Xcm emulator nits (#1649)

# Desription

## Summary 

This PR introduces several nits and tweaks to xcm emulator tests for
system parachains.

## Explanation

**Deduplicate `XcmPallet::send(` with root origin code**
- Introduced `send_transact_to_parachain` which could be easily reuse
for scenarios like _governance call from relay chain to parachain_.

**Refactor `send_transact_sudo_from_relay_to_system_para_works`**
- Test covered just one use-case which was moved to the
`do_force_create_asset_from_relay_to_system_para`, so now we can extend
this test with more _governance-like_ senarios.
- Renamed to
`send_transact_as_superuser_from_relay_to_system_para_works`.

**Remove `send_transact_native_from_relay_to_system_para_fails` test**
- This test and/or description is kind of misleading, because system
paras support Native from relay chain by `RelayChainAsNative` with
correct xcm origin.
- It tested only sending on relay chain which should go directly to the
relay chain unit-tests (does not even need to be in xcm emulator level).

## Future directions

Check restructure parachains integration tests
[issue](https://github.com/paritytech/polkadot-sdk/issues/1389) and [PR
with more TODOs](https://github.com/paritytech/polkadot-sdk/pull/1693).

---------

Co-authored-by: Ignacio Palacios <ignacio.palacios.santos@gmail.com>

cumulus/parachains/integration-tests/emulated/assets/asset-hub-westend/src/tests/reserve_transfer.rs

@@ -349,6 +349,7 @@ fn limited_reserve_transfer_asset_from_system_para_to_para() {
 		ASSET_MIN_BALANCE,
 		true,
 		AssetHubWestendSender::get(),
+		Some(Weight::from_parts(1_019_445_000, 200_000)),
 		ASSET_MIN_BALANCE * 1000000,
 	);
 
@@ -384,6 +385,7 @@ fn reserve_transfer_asset_from_system_para_to_para() {
 		ASSET_MIN_BALANCE,
 		true,
 		AssetHubWestendSender::get(),
+		Some(Weight::from_parts(1_019_445_000, 200_000)),
 		ASSET_MIN_BALANCE * 1000000,
 	);
 

cumulus/parachains/integration-tests/emulated/assets/asset-hub-westend/src/tests/send.rs

@@ -16,52 +16,16 @@
 use crate::*;
 
 /// Relay Chain should be able to execute `Transact` instructions in System Parachain
-/// when `OriginKind::Superuser` and signer is `sudo`
+/// when `OriginKind::Superuser`.
 #[test]
-fn send_transact_sudo_from_relay_to_system_para_works() {
+fn send_transact_as_superuser_from_relay_to_system_para_works() {
-	// Init tests variables
+	AssetHubWestend::force_create_asset_from_relay_as_root(
-	let root_origin = <Westend as Chain>::RuntimeOrigin::root();
-	let system_para_destination = Westend::child_location_of(AssetHubWestend::para_id()).into();
-	let asset_owner: AccountId = AssetHubWestendSender::get().into();
-	let xcm = AssetHubWestend::force_create_asset_xcm(
-		OriginKind::Superuser,
 		ASSET_ID,
-		asset_owner.clone(),
+		ASSET_MIN_BALANCE,
 		true,
-		1000,
+		AssetHubWestendSender::get().into(),
-	);
+		Some(Weight::from_parts(1_019_445_000, 200_000)),
-	// Send XCM message from Relay Chain
+	)
-	Westend::execute_with(|| {
-		assert_ok!(<Westend as WestendPallet>::XcmPallet::send(
-			root_origin,
-			bx!(system_para_destination),
-			bx!(xcm),
-		));
-
-		Westend::assert_xcm_pallet_sent();
-	});
-
-	// Receive XCM message in Assets Parachain
-	AssetHubWestend::execute_with(|| {
-		type RuntimeEvent = <AssetHubWestend as Chain>::RuntimeEvent;
-
-		AssetHubWestend::assert_dmp_queue_complete(Some(Weight::from_parts(
-			1_019_445_000,
-			200_000,
-		)));
-
-		assert_expected_events!(
-			AssetHubWestend,
-			vec![
-				RuntimeEvent::Assets(pallet_assets::Event::ForceCreated { asset_id, owner }) => {
-					asset_id: *asset_id == ASSET_ID,
-					owner: *owner == asset_owner,
-				},
-			]
-		);
-
-		assert!(<AssetHubWestend as AssetHubWestendPallet>::Assets::asset_exists(ASSET_ID));
-	});
 }
 
 /// Parachain should be able to send XCM paying its fee with sufficient asset
@@ -78,6 +42,7 @@ fn send_xcm_from_para_to_system_para_paying_fee_with_assets_works() {
 		ASSET_MIN_BALANCE,
 		true,
 		para_sovereign_account.clone(),
+		Some(Weight::from_parts(1_019_445_000, 200_000)),
 		ASSET_MIN_BALANCE * 1000000000,
 	);
 

cumulus/parachains/integration-tests/emulated/assets/asset-hub-westend/src/tests/set_xcm_versions.rs

@@ -47,32 +47,22 @@ fn relay_sets_system_para_xcm_supported_version() {
 #[test]
 fn system_para_sets_relay_xcm_supported_version() {
 	// Init test variables
-	let sudo_origin = <Westend as Chain>::RuntimeOrigin::root();
 	let parent_location = AssetHubWestend::parent_location();
-	let system_para_destination: VersionedMultiLocation =
+	let force_xcm_version_call =
-		Westend::child_location_of(AssetHubWestend::para_id()).into();
+		<AssetHubWestend as Chain>::RuntimeCall::PolkadotXcm(pallet_xcm::Call::<
-	let call = <AssetHubWestend as Chain>::RuntimeCall::PolkadotXcm(pallet_xcm::Call::<
+			<AssetHubWestend as Chain>::Runtime,
-		<AssetHubWestend as Chain>::Runtime,
+		>::force_xcm_version {
-	>::force_xcm_version {
+			location: bx!(parent_location),
-		location: bx!(parent_location),
+			version: XCM_V3,
-		version: XCM_V3,
+		})
-	})
+		.encode()
-	.encode()
+		.into();
-	.into();
-	let origin_kind = OriginKind::Superuser;
 
-	let xcm = xcm_transact_unpaid_execution(call, origin_kind);
+	// System Parachain sets supported version for Relay Chain through it
-
+	Westend::send_unpaid_transact_to_parachain_as_root(
-	// System Parachain sets supported version for Relay Chain throught it
+		AssetHubWestend::para_id(),
-	Westend::execute_with(|| {
+		force_xcm_version_call,
-		assert_ok!(<Westend as WestendPallet>::XcmPallet::send(
+	);
-			sudo_origin,
-			bx!(system_para_destination),
-			bx!(xcm),
-		));
-
-		Westend::assert_xcm_pallet_sent();
-	});
 
 	// System Parachain receive the XCM message
 	AssetHubWestend::execute_with(|| {

cumulus/parachains/integration-tests/emulated/common/src/impls.rs

@@ -54,7 +54,7 @@ pub use polkadot_runtime_parachains::{
 	inclusion::{AggregateMessageOrigin, UmpQueueId},
 };
 pub use xcm::{
-	prelude::{OriginKind, Outcome, VersionedXcm, Weight},
+	prelude::{MultiLocation, OriginKind, Outcome, VersionedXcm, Weight},
 	v3::Error,
 	DoubleEncoded,
 };
@@ -80,21 +80,11 @@ impl From<u32> for LaneIdWrapper {
 type BridgeHubRococoRuntime = <BridgeHubRococo as Chain>::Runtime;
 type BridgeHubWococoRuntime = <BridgeHubWococo as Chain>::Runtime;
 
-// TODO: uncomment when https://github.com/paritytech/polkadot-sdk/pull/1352 is merged
-// type BridgeHubPolkadotRuntime = <BridgeHubPolkadot as Chain>::Runtime;
-// type BridgeHubKusamaRuntime = <BridgeHubKusama as Chain>::Runtime;
-
 pub type RococoWococoMessageHandler =
 	BridgeHubMessageHandler<BridgeHubRococoRuntime, BridgeHubWococoRuntime, Instance2>;
 pub type WococoRococoMessageHandler =
 	BridgeHubMessageHandler<BridgeHubWococoRuntime, BridgeHubRococoRuntime, Instance2>;
 
-// TODO: uncomment when https://github.com/paritytech/polkadot-sdk/pull/1352 is merged
-// pub type PolkadotKusamaMessageHandler
-//	= BridgeHubMessageHandler<BridgeHubPolkadotRuntime, BridgeHubKusamaRuntime, Instance1>;
-// pub type KusamaPolkadotMessageHandler
-//	= BridgeHubMessageHandler<BridgeHubKusamaRuntime, BridgeHubPolkadoRuntime, Instance1>;
-
 impl<S, T, I> BridgeMessageHandler for BridgeHubMessageHandler<S, T, I>
 where
 	S: Config<Instance1>,
@@ -356,6 +346,37 @@ macro_rules! impl_hrmp_channels_helpers_for_relay_chain {
 	};
 }
 
+#[macro_export]
+macro_rules! impl_send_transact_helpers_for_relay_chain {
+	( $chain:ident ) => {
+		$crate::impls::paste::paste! {
+			impl $chain {
+				/// A root origin (as governance) sends `xcm::Transact` with `UnpaidExecution` and encoded `call` to child parachain.
+				pub fn send_unpaid_transact_to_parachain_as_root(
+					recipient: $crate::impls::ParaId,
+					call: $crate::impls::DoubleEncoded<()>
+				) {
+					use $crate::impls::{bx, Chain, RelayChain};
+
+					<Self as $crate::impls::TestExt>::execute_with(|| {
+						let root_origin = <Self as Chain>::RuntimeOrigin::root();
+						let destination:  $crate::impls::MultiLocation = <Self as RelayChain>::child_location_of(recipient);
+						let xcm = $crate::impls::xcm_transact_unpaid_execution(call, $crate::impls::OriginKind::Superuser);
+
+						// Send XCM `Transact`
+						$crate::impls::assert_ok!(<Self as [<$chain Pallet>]>::XcmPallet::send(
+							root_origin,
+							bx!(destination.into()),
+							bx!(xcm),
+						));
+						Self::assert_xcm_pallet_sent();
+					});
+				}
+			}
+		}
+	};
+}
+
 #[macro_export]
 macro_rules! impl_accounts_helpers_for_parachain {
 	( $chain:ident ) => {
@@ -616,53 +637,58 @@ macro_rules! impl_assets_helpers_for_parachain {
 					min_balance: u128,
 					is_sufficient: bool,
 					asset_owner: $crate::impls::AccountId,
+					dmp_weight_threshold: Option<$crate::impls::Weight>,
 					amount_to_mint: u128,
 				) {
-					use $crate::impls::{bx, Chain, RelayChain, Parachain, Inspect, TestExt};
+					use $crate::impls::Chain;
-					// Init values for Relay Chain
+
-					let root_origin = <$relay_chain as Chain>::RuntimeOrigin::root();
+					// Force create asset
-					let destination = <$relay_chain>::child_location_of(<$chain>::para_id());
+					Self::force_create_asset_from_relay_as_root(
-					let xcm = Self::force_create_asset_xcm(
-						$crate::impls::OriginKind::Superuser,
 						id,
-						asset_owner.clone(),
-						is_sufficient,
 						min_balance,
+						is_sufficient,
+						asset_owner.clone(),
+						dmp_weight_threshold
 					);
 
-					<$relay_chain>::execute_with(|| {
+					// Mint asset for System Parachain's sender
-						$crate::impls::assert_ok!(<$relay_chain as [<$relay_chain Pallet>]>::XcmPallet::send(
+					let signed_origin = <Self as Chain>::RuntimeOrigin::signed(asset_owner.clone());
-							root_origin,
+					Self::mint_asset(signed_origin, id, asset_owner, amount_to_mint);
-							bx!(destination.into()),
+				}
-							bx!(xcm),
-						));
 
-						<$relay_chain>::assert_xcm_pallet_sent();
+				/// Relay Chain sends `Transact` instruction with `force_create_asset` to Parachain with `Assets` instance of `pallet_assets` .
-					});
+				pub fn force_create_asset_from_relay_as_root(
+					id: u32,
+					min_balance: u128,
+					is_sufficient: bool,
+					asset_owner: $crate::impls::AccountId,
+					dmp_weight_threshold: Option<$crate::impls::Weight>,
+				) {
+					use $crate::impls::{Parachain, Inspect, TestExt};
 
+					<$relay_chain>::send_unpaid_transact_to_parachain_as_root(
+						Self::para_id(),
+						Self::force_create_asset_call(id, asset_owner.clone(), is_sufficient, min_balance),
+					);
+
+					// Receive XCM message in Assets Parachain
 					Self::execute_with(|| {
-						Self::assert_dmp_queue_complete(Some($crate::impls::Weight::from_parts(1_019_445_000, 200_000)));
-
 						type RuntimeEvent = <$chain as $crate::impls::Chain>::RuntimeEvent;
 
+						Self::assert_dmp_queue_complete(dmp_weight_threshold);
+
 						$crate::impls::assert_expected_events!(
 							Self,
 							vec![
-								// Asset has been created
 								RuntimeEvent::Assets($crate::impls::pallet_assets::Event::ForceCreated { asset_id, owner }) => {
 									asset_id: *asset_id == id,
-									owner: *owner == asset_owner.clone(),
+									owner: *owner == asset_owner,
 								},
 							]
 						);
 
 						assert!(<Self as [<$chain Pallet>]>::Assets::asset_exists(id.into()));
 					});
-
-					let signed_origin = <Self as Chain>::RuntimeOrigin::signed(asset_owner.clone());
-
-					// Mint asset for System Parachain's sender
-					Self::mint_asset(signed_origin, id, asset_owner, amount_to_mint);
 				}
 			}
 		}

cumulus/parachains/integration-tests/emulated/common/src/lib.rs

@@ -250,30 +250,22 @@ decl_test_bridges! {
 		target = BridgeHubRococo,
 		handler = WococoRococoMessageHandler
 	}
-	// TODO: uncomment when https://github.com/paritytech/polkadot-sdk/pull/1352 is merged
-	// pub struct PolkadotKusamaMockBridge {
-	// 	source = BridgeHubPolkadot,
-	// 	target = BridgeHubKusama,
-	//  handler = PolkadotKusamaMessageHandler
-	// },
-	// pub struct KusamaPolkadotMockBridge {
-	// 	source = BridgeHubKusama,
-	// 	target = BridgeHubPolkadot,
-	// 	handler = KusamaPolkadotMessageHandler
-	// }
 }
 
 // Westend implementation
 impl_accounts_helpers_for_relay_chain!(Westend);
 impl_assert_events_helpers_for_relay_chain!(Westend);
+impl_send_transact_helpers_for_relay_chain!(Westend);
 
 // Rococo implementation
 impl_accounts_helpers_for_relay_chain!(Rococo);
 impl_assert_events_helpers_for_relay_chain!(Rococo);
+impl_send_transact_helpers_for_relay_chain!(Rococo);
 
 // Wococo implementation
 impl_accounts_helpers_for_relay_chain!(Wococo);
 impl_assert_events_helpers_for_relay_chain!(Wococo);
+impl_send_transact_helpers_for_relay_chain!(Wococo);
 
 // AssetHubWestend implementation
 impl_accounts_helpers_for_parachain!(AssetHubWestend);