test: add test for sign_message, 6248#

Author: fdefelici

testnet/stacks-node/src/operations.rs

@@ -96,4 +96,45 @@ mod tests {
         let mut op_signer = BurnchainOpSigner::new(secp_k, false);
         assert_eq!(expected_hex, op_signer.get_public_key().to_hex());
     }
+
+    #[test]
+    fn test_sign_message_ok() {
+        let priv_key_hex = "0c28fca386c7a227600b2fe50b7cae11ec86d3bf1fbe471be89827e19d72aa1d";
+        let message = &[0u8; 32];
+        let expected_msg_sig = "00b911e6cf9c49b738c4a0f5e33c003fa5b74a00ddc68e574e9f1c3504f6ba7e84275fd62773978cc8165f345cc3f691cf68be274213d552e79af39998df61273f";
+       
+        let secp_k = Secp256k1PrivateKey::from_hex(priv_key_hex).unwrap();
+        let mut op_signer = BurnchainOpSigner::new(secp_k, false);
+
+        let msg_sig = op_signer.sign_message(message)
+            .expect("Message should be signed!");
+
+        assert_eq!(expected_msg_sig, msg_sig.to_hex());
+    }
+
+    #[test]
+    fn test_sign_message_fails_due_to_hash_length() {
+        let priv_key_hex = "0c28fca386c7a227600b2fe50b7cae11ec86d3bf1fbe471be89827e19d72aa1d";
+        let message = &[0u8; 20];
+       
+        let secp_k = Secp256k1PrivateKey::from_hex(priv_key_hex).unwrap();
+        let mut op_signer = BurnchainOpSigner::new(secp_k, false);
+
+        let result = op_signer.sign_message(message);
+        assert!(result.is_none());
+    }
+
+    #[test]
+    fn test_sign_message_fails_due_to_disposal() {
+        let priv_key_hex = "0c28fca386c7a227600b2fe50b7cae11ec86d3bf1fbe471be89827e19d72aa1d";
+        let message = &[0u8; 32];
+       
+        let secp_k = Secp256k1PrivateKey::from_hex(priv_key_hex).unwrap();
+        let mut op_signer = BurnchainOpSigner::new(secp_k, false);
+
+        op_signer.dispose();
+
+        let result = op_signer.sign_message(message);
+        assert!(result.is_none());
+    }
 }