diff --git a/src/tests/helpers.rs b/src/tests/helpers.rs
index ad27f75ed..703c8639b 100644
--- a/src/tests/helpers.rs
+++ b/src/tests/helpers.rs
@@ -45,7 +45,7 @@ pub fn create_test_block(header: &Header) -> Bytes {
 	rlp.out()
 }
 
-fn create_unverifiable_block(order: usize, parent_hash: H256) -> Bytes {
+fn create_unverifiable_block_header(order: usize, parent_hash: H256) -> Header {
 	let mut header = Header::new();
 	header.gas_limit = x!(0);
 	header.difficulty = x!(order * 100);
@@ -54,6 +54,23 @@ fn create_unverifiable_block(order: usize, parent_hash: H256) -> Bytes {
 	header.parent_hash = parent_hash;
 	header.state_root = H256::from_str("0000000000000000000000000000000000000000000000000000000000000000").unwrap();
 
+	header
+}
+
+fn create_unverifiable_block(order: usize, parent_hash: H256) -> Bytes {
+	create_test_block_header(&create_unverifiable_block_header(order, parent_hash))
+}
+
+fn create_unverifiable_block_with_extra(order: usize, parent_hash: H256, Option<Bytes> extra) -> Bytes {
+	let mut header = create_test_block_header(order, parent_hash);
+	header.extra_data = match extra {
+		Some(extra_data) => extra_data,
+		None => {
+			let base = order as u8;
+		    vec!([1, 2, 3])
+		}
+	}
+
 	create_test_block(&header)
 }
 
@@ -104,4 +121,6 @@ pub fn generate_dummy_blockchain(block_number: usize) -> BlockChain {
 		bc.insert_block(&create_unverifiable_block(block_order, bc.best_block_hash()));
 	}
 	bc
-}
\ No newline at end of file
+}
+
+pub fn generate_dummy_blockchain_with_extra(block_number: uszie
\ No newline at end of file