test: cover wire protocol error roundtrips

crates/geth-control/src/lib.rs

@@ -3145,6 +3145,24 @@ mod tests {
             request
         );
 
+        let response = PipeWireResponse::Error {
+            message: "pipe denied".to_owned(),
+        };
+        assert_eq!(
+            decode_pipe_wire_response(&encode_pipe_wire_response(&response).expect("encode"))
+                .expect("decode"),
+            response
+        );
+
+        let response = OverlayWireResponse::Error {
+            message: "overlay denied".to_owned(),
+        };
+        assert_eq!(
+            decode_overlay_wire_response(&encode_overlay_wire_response(&response).expect("encode"))
+                .expect("decode"),
+            response
+        );
+
         let response = PeerControlResponse::SshProxyConnected {
             node_id: "node:peer".to_owned(),
             agent_id: "agent:peer".to_owned(),