test: reject message (de)serialization

This adds tests for the previously untested reject message
(de)serialization. The two reject messages were received from an
older Bitcoin Core peer that still sends reject messages.

src/network/message_network.rs

@@ -146,8 +146,11 @@ impl_consensus_encoding!(Reject, message, ccode, reason, hash);
 #[cfg(test)]
 mod tests {
     use super::VersionMessage;
+    use super::Reject;
+    use super::RejectReason;
 
     use hashes::hex::FromHex;
+    use hashes::sha256d::Hash;
     use network::constants::ServiceFlags;
 
     use consensus::encode::{deserialize, serialize};
@@ -171,4 +174,37 @@ mod tests {
 
         assert_eq!(serialize(&real_decode), from_sat);
     }
+
+    #[test]
+    fn reject_message_test() {
+        let reject_tx_conflict = Vec::from_hex("027478121474786e2d6d656d706f6f6c2d636f6e666c69637405df54d3860b3c41806a3546ab48279300affacf4b88591b229141dcf2f47004").unwrap();
+        let reject_tx_nonfinal = Vec::from_hex("02747840096e6f6e2d66696e616c259bbe6c83db8bbdfca7ca303b19413dc245d9f2371b344ede5f8b1339a5460b").unwrap();
+
+        let decode_result_conflict: Result<Reject, _> = deserialize(&reject_tx_conflict);
+        let decode_result_nonfinal: Result<Reject, _> = deserialize(&reject_tx_nonfinal);
+
+        assert!(decode_result_conflict.is_ok());
+        assert!(decode_result_nonfinal.is_ok());
+
+        let conflict = decode_result_conflict.unwrap();
+        assert_eq!("tx", conflict.message);
+        assert_eq!(RejectReason::Duplicate, conflict.ccode);
+        assert_eq!("txn-mempool-conflict", conflict.reason);
+        assert_eq!(
+            Hash::from_hex("0470f4f2dc4191221b59884bcffaaf00932748ab46356a80413c0b86d354df05").unwrap(),
+            conflict.hash
+        );
+
+        let nonfinal = decode_result_nonfinal.unwrap();
+        assert_eq!("tx", nonfinal.message);
+        assert_eq!(RejectReason::NonStandard, nonfinal.ccode);
+        assert_eq!("non-final", nonfinal.reason);
+        assert_eq!(
+            Hash::from_hex("0b46a539138b5fde4e341b37f2d945c23d41193b30caa7fcbd8bdb836cbe9b25").unwrap(),
+            nonfinal.hash
+        );
+
+        assert_eq!(serialize(&conflict), reject_tx_conflict);
+        assert_eq!(serialize(&nonfinal), reject_tx_nonfinal);
+    }
 }