add test case: header marshal

tests/headers.rs

@@ -2,7 +2,9 @@
 mod tests {
     use tenjin::{
         openflow::{
-            controller_frame::ControllerFrame, ofp_manager::OfpMsgEvent, ofp_v1_0::Openflow10,
+            controller_frame::ControllerFrame,
+            ofp_manager::{OfpMsg, OfpMsgEvent},
+            ofp_v1_0::Openflow10,
         },
         Controller,
     };
@@ -13,12 +15,23 @@ mod tests {
 
         let controller = Controller::new(Openflow10::new());
         let ofp = controller.get_ofp();
-
         let header = ofp.header_parse(&ofp_header_bytes);
 
         assert_eq!(header.version(), 1);
         assert_eq!(header.message(), 0);
         assert_eq!(header.length(), 8);
         assert_eq!(header.xid(), 1);
     }
+    #[test]
+    fn test_header_v1_0_marshal() {
+        let ofp_header_bytes: Vec<u8> = vec![1, 0, 0, 8, 0, 0, 0, 0];
+
+        let controller = Controller::new(Openflow10::new());
+        let ofp = controller.get_ofp();
+        let ofp_header = ofp.header(ofp.msg_usize(OfpMsg::Hello) as u8, 0, 0);
+        let mut bytes: Vec<u8> = Vec::new();
+        ofp_header.marshal(&mut bytes);
+
+        assert_eq!(ofp_header_bytes, bytes);
+    }
 }