UMP: Acceptance criteria & enactment

runtime/common/src/paras_registrar.rs

@@ -425,7 +425,9 @@ mod tests {
 		type WeightInfo = ();
 	}
 
-	impl router::Trait for Test { }
+	impl router::Trait for Test {
+		type UmpSink = ();
+	}
 
 	impl pallet_session::historical::Trait for Test {
 		type FullIdentification = pallet_staking::Exposure<u64, Balance>;

runtime/parachains/src/mock.rs

@@ -108,7 +108,9 @@ impl crate::paras::Trait for Test {
 	type Origin = Origin;
 }
 
-impl crate::router::Trait for Test { }
+impl crate::router::Trait for Test {
+	type UmpSink = crate::router::MockUmpSink;
+}
 
 impl crate::scheduler::Trait for Test { }
 

runtime/parachains/src/router.rs

@@ -33,8 +33,15 @@ mod dmp;
 mod ump;
 
 pub use dmp::QueueDownwardMessageError;
+pub use ump::UmpSink;
 
-pub trait Trait: frame_system::Trait + configuration::Trait {}
+#[cfg(test)]
+pub use ump::mock_sink::MockUmpSink;
+
+pub trait Trait: frame_system::Trait + configuration::Trait {
+	/// A place where all received upward messages are funneled.
+	type UmpSink: UmpSink;
+}
 
 decl_storage! {
 	trait Store for Module<T: Trait> as Router {