Functionalize tx serialization; make testing more explicit

core/src/blockstream.rs

@@ -93,11 +93,7 @@ where
         leader_id: &Pubkey,
         entry: &Entry,
     ) -> Result<()> {
-        let transactions: Vec<Vec<u8>> = entry
-            .transactions
-            .iter()
-            .map(|tx| serialize(&tx).unwrap())
-            .collect();
+        let transactions: Vec<Vec<u8>> = serialize_transactions(entry);
         let stream_entry = json!({
             "num_hashes": entry.num_hashes,
             "hash": entry.hash,
@@ -160,6 +156,14 @@ impl MockBlockstream {
     }
 }
 
+fn serialize_transactions(entry: &Entry) -> Vec<Vec<u8>> {
+    entry
+        .transactions
+        .iter()
+        .map(|tx| serialize(&tx).unwrap())
+        .collect()
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -168,8 +172,28 @@ mod test {
     use serde_json::Value;
     use solana_sdk::hash::Hash;
     use solana_sdk::signature::{Keypair, KeypairUtil};
+    use solana_sdk::system_transaction::SystemTransaction;
     use std::collections::HashSet;
 
+    #[test]
+    fn test_serialize_transactions() {
+        let entry = Entry::new(&Hash::default(), 1, vec![]);
+        let empty_vec: Vec<Vec<u8>> = vec![];
+        assert_eq!(serialize_transactions(&entry), empty_vec);
+
+        let keypair0 = Keypair::new();
+        let keypair1 = Keypair::new();
+        let tx0 = SystemTransaction::new_move(&keypair0, &keypair1.pubkey(), 1, Hash::default(), 0);
+        let tx1 = SystemTransaction::new_move(&keypair1, &keypair0.pubkey(), 2, Hash::default(), 0);
+        let serialized_tx0 = serialize(&tx0).unwrap();
+        let serialized_tx1 = serialize(&tx1).unwrap();
+        let entry = Entry::new(&Hash::default(), 1, vec![tx0, tx1]);
+        assert_eq!(
+            serialize_transactions(&entry),
+            vec![serialized_tx0, serialized_tx1]
+        );
+    }
+
     #[test]
     fn test_blockstream() -> () {
         let blockstream = MockBlockstream::new("test_stream".to_string());

core/src/blockstream_service.rs

@@ -109,7 +109,7 @@ mod test {
     use super::*;
     use crate::blocktree::create_new_tmp_ledger;
     use crate::entry::{create_ticks, Entry};
-    use bincode::deserialize;
+    use bincode::{deserialize, serialize};
     use chrono::{DateTime, FixedOffset};
     use serde_json::Value;
     use solana_sdk::genesis_block::GenesisBlock;
@@ -197,8 +197,14 @@ mod test {
                         .as_array()
                         .unwrap()
                         .into_iter()
-                        .map(|tx| {
+                        .enumerate()
+                        .map(|(j, tx)| {
                             let tx_vec: Vec<u8> = serde_json::from_value(tx.clone()).unwrap();
+                            // Check explicitly that transaction matches bincode-serialized format
+                            assert_eq!(
+                                tx_vec,
+                                serialize(&expected_entries[i].transactions[j]).unwrap()
+                            );
                             deserialize(&tx_vec).unwrap()
                         })
                         .collect(),