diff --git a/tests/pubsub/testgossipinternal.nim b/tests/pubsub/testgossipinternal.nim
index 777b479789..79a6f4eff3 100644
--- a/tests/pubsub/testgossipinternal.nim
+++ b/tests/pubsub/testgossipinternal.nim
@@ -662,6 +662,60 @@ suite "GossipSub internal":
     await allFuturesThrowing(conns.mapIt(it.close()))
     await gossipSub.switch.stop()
 
+      # test cases for block 5 gossibsub test plan 
+      # check correctly parsed ihave/iwant/graft/prune/idontwant messages
+      # check value before & after decoding equal using protoc cmd tool for reference
+  asyncTest "Check RPCMsg encoding":
+    let backofftime = 10.uint64
+    var id: seq[byte] = @[123]
+    let rpcMsg = RPCMsg(
+      control: some(
+        ControlMessage(
+          ihave: @[ControlIHave(topicID: "foobar", messageIDs: @[id])],
+          iwant: @[ControlIWant(messageIDs: @[id])],
+          graft: @[ControlGraft(topicID: "foobar")],
+          prune: @[ControlPrune(topicID: "foobar", backoff: backofftime)],
+          idontwant: @[ControlIWant(messageIDs: @[id])],
+        )
+      )
+    )
+    let encodedExpected: seq[byte] =
+      @[
+        26, 51, 10, 10, 6, 102, 111, 111, 98, 97, 114, 18, 3, 49, 50, 51, 18, 5, 10, 3,
+        49, 50, 51, 26, 8, 10, 6, 102, 111, 111, 98, 97, 114, 34, 10, 10, 6, 102, 111,
+        111, 98, 97, 114, 16, 10, 42, 5, 10, 3, 49, 50, 51,
+      ] #encoded using protoc cmd tool
+
+    let encodedMsg = encodeRpcMsg(rpcMsg, true)
+    check:
+      encodedExpected == encodedMsg
+
+  asyncTest "Check RPCMsg decoding":
+    let backofftime = 12.uint64
+    let id: seq[byte] = @[1]
+    let originMessage = RPCMsg(
+      control: some(
+        ControlMessage(
+          ihave: @[ControlIHave(topicID: "foobar", messageIDs: @[id])],
+          iwant: @[ControlIWant(messageIDs: @[id])],
+          graft: @[ControlGraft(topicID: "topic")],
+          prune: @[ControlPrune(topicID: "new", backoff: backofftime)],
+          idontwant: @[ControlIWant(messageIDs: @[id])],
+        )
+      )
+    )
+    #data encoded using protoc cmd tool
+    let encodedMsg: seq[byte] =
+      @[
+        26, 41, 10, 11, 10, 6, 102, 111, 111, 98, 97, 114, 18, 1, 49, 18, 3, 10, 1, 49,
+        26, 7, 10, 5, 116, 111, 112, 105, 99, 34, 7, 10, 3, 110, 101, 119, 16, 12, 42,
+        3, 10, 1, 49,
+      ]
+
+    var rpcMsg = decodeRpcMsg(encodedMsg).value
+    check:
+      rpcMsg == originMessage
+
   asyncTest "handleIHave/Iwant tests":
     let gossipSub = TestGossipSub.init(newStandardSwitch())