test: ✅ initialize ParachainSystem HostConfiguration in runtime tests

The ParentAsUmp XCM router now validates upward messages by checking   HostConfiguration, which was previously uninitialized in test environments,   causing ErrorValidating and SendFailure errors.

runtime/moonbase/tests/common/mod.rs

@@ -289,6 +289,27 @@ impl ExtBuilder {
 		let xcm_assets = self.xcm_assets.clone();
 
 		ext.execute_with(|| {
+			// Mock host configuration for ParachainSystem
+			use cumulus_primitives_core::relay_chain::AbridgedHostConfiguration;
+			cumulus_pallet_parachain_system::HostConfiguration::<Runtime>::put(
+				AbridgedHostConfiguration {
+					max_code_size: 3_145_728,
+					max_head_data_size: 20_480,
+					max_upward_queue_count: 174_762,
+					max_upward_queue_size: 1_048_576,
+					max_upward_message_size: 65_531,
+					max_upward_message_num_per_candidate: 16,
+					hrmp_max_message_num_per_candidate: 10,
+					validation_upgrade_cooldown: 6,
+					validation_upgrade_delay: 6,
+					async_backing_params:
+						cumulus_primitives_core::relay_chain::AsyncBackingParams {
+							max_candidate_depth: 3,
+							allowed_ancestry_len: 2,
+						},
+				},
+			);
+
 			// Mock hrmp egress_channels
 			cumulus_pallet_parachain_system::RelevantMessagingState::<Runtime>::put(
 				MessagingStateSnapshot {

runtime/moonbeam/tests/common/mod.rs

@@ -317,6 +317,27 @@ impl ExtBuilder {
 		let mut ext = sp_io::TestExternalities::new(t);
 		let xcm_assets = self.xcm_assets.clone();
 		ext.execute_with(|| {
+			// Mock host configuration for ParachainSystem
+			use cumulus_primitives_core::relay_chain::AbridgedHostConfiguration;
+			cumulus_pallet_parachain_system::HostConfiguration::<Runtime>::put(
+				AbridgedHostConfiguration {
+					max_code_size: 3_145_728,
+					max_head_data_size: 20_480,
+					max_upward_queue_count: 174_762,
+					max_upward_queue_size: 1_048_576,
+					max_upward_message_size: 65_531,
+					max_upward_message_num_per_candidate: 16,
+					hrmp_max_message_num_per_candidate: 10,
+					validation_upgrade_cooldown: 6,
+					validation_upgrade_delay: 6,
+					async_backing_params:
+						cumulus_primitives_core::relay_chain::AsyncBackingParams {
+							max_candidate_depth: 3,
+							allowed_ancestry_len: 2,
+						},
+				},
+			);
+
 			// Mock hrmp egress_channels
 			cumulus_pallet_parachain_system::RelevantMessagingState::<Runtime>::put(
 				MessagingStateSnapshot {

runtime/moonriver/tests/common/mod.rs

@@ -317,6 +317,27 @@ impl ExtBuilder {
 		let mut ext = sp_io::TestExternalities::new(t);
 		let xcm_assets = self.xcm_assets.clone();
 		ext.execute_with(|| {
+			// Mock host configuration for ParachainSystem
+			use cumulus_primitives_core::relay_chain::AbridgedHostConfiguration;
+			cumulus_pallet_parachain_system::HostConfiguration::<Runtime>::put(
+				AbridgedHostConfiguration {
+					max_code_size: 3_145_728,
+					max_head_data_size: 20_480,
+					max_upward_queue_count: 174_762,
+					max_upward_queue_size: 1_048_576,
+					max_upward_message_size: 65_531,
+					max_upward_message_num_per_candidate: 16,
+					hrmp_max_message_num_per_candidate: 10,
+					validation_upgrade_cooldown: 6,
+					validation_upgrade_delay: 6,
+					async_backing_params:
+						cumulus_primitives_core::relay_chain::AsyncBackingParams {
+							max_candidate_depth: 3,
+							allowed_ancestry_len: 2,
+						},
+				},
+			);
+
 			// Mock hrmp egress_channels
 			cumulus_pallet_parachain_system::RelevantMessagingState::<Runtime>::put(
 				MessagingStateSnapshot {