Parse substrate message proof (#479)

* parse substrate message proof

* unfinalized_header

bridges/modules/substrate/src/mock.rs

@@ -93,6 +93,7 @@ pub fn run_test<T>(test: impl FnOnce() -> T) -> T {
 
 pub mod helpers {
 	use super::*;
+	use crate::storage::ImportedHeader;
 	use crate::{BridgedBlockHash, BridgedBlockNumber, BridgedHeader};
 	use finality_grandpa::voter_set::VoterSet;
 	use sp_finality_grandpa::{AuthorityId, AuthorityList};
@@ -114,6 +115,15 @@ pub mod helpers {
 		header
 	}
 
+	pub fn unfinalized_header(num: u64) -> ImportedHeader<TestHeader> {
+		ImportedHeader {
+			header: test_header(num),
+			requires_justification: false,
+			is_finalized: false,
+			signal_hash: None,
+		}
+	}
+
 	pub fn header_id(index: u8) -> HeaderId {
 		(test_header(index.into()).hash(), index as _)
 	}