Add RLP encoding to RecentProposerRecord

src/state/recent_proposer_record.rs

@@ -1,3 +1,4 @@
+use super::rlp::{ RlpStream, Encodable };
 use super::utils::types::*;
 
 pub struct RecentPropserRecord {
@@ -17,3 +18,34 @@ impl RecentPropserRecord {
         }
     }
 }
+
+/*
+ * RLP Encoding
+ */
+impl Encodable for RecentPropserRecord {
+    fn rlp_append(&self, s: &mut RlpStream) {
+        s.append(&self.index);
+        s.append(&self.randao_commitment);
+        s.append(&self.balance_delta);
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::super::rlp;
+    use super::*;
+
+    #[test]
+    fn test_serialization() {
+        let index = 1;
+        let randao_commitment = Sha256Digest::zero();
+        let balance_delta = 99;
+        let r = RecentPropserRecord::new(index, randao_commitment, balance_delta);
+        let e = rlp::encode(&r);
+        assert_eq!(e[0], 1);
+        assert_eq!(e[1], 160);
+        assert_eq!(e[2..34], [0; 32]);
+        assert_eq!(e[34], 99);
+    }
+}