more validator tests

lighthouse/db/src/stores/beacon_block_store.rs

@@ -273,7 +273,7 @@ mod tests {
             let mut s = SszStream::new();
             s.append(&block);
             let ssz = s.drain();
-            bs.put_serialized_block(&hashes[i].to_vec(), &ssz).unwrap();
+            db.put(DB_COLUMN, &hashes[i].to_vec(), &ssz).unwrap();
         }
 
         let tuple = bs.block_at_slot(&hashes[4], 5).unwrap().unwrap();

lighthouse/db/src/stores/validator_store.rs

@@ -82,6 +82,25 @@ mod tests {
     use super::super::bls::Keypair;
     use super::*;
 
+    #[test]
+    fn test_prefix_bytes() {
+        let db = Arc::new(MemoryDB::open());
+        let store = ValidatorStore::new(db.clone());
+
+        assert_eq!(store.prefix_bytes(&KeyPrefixes::PublicKey), b"pubkey".to_vec());
+    }
+
+    #[test]
+    fn test_get_db_key_for_index() {
+        let db = Arc::new(MemoryDB::open());
+        let store = ValidatorStore::new(db.clone());
+
+        let mut buf = BytesMut::with_capacity(6 + 8);
+        buf.put(b"pubkey".to_vec());
+        buf.put_u64_be(42);
+        assert_eq!(store.get_db_key_for_index(&KeyPrefixes::PublicKey, 42), buf.take().to_vec())
+    }
+
     #[test]
     fn test_put_public_key_by_index() {
         let db = Arc::new(MemoryDB::open());