Merge pull request #7303 from ziggie1984/fuzz_tests_custommessages

Add Custom Message to Fuzz Testing

docs/release-notes/release-notes-0.16.0.md

@@ -225,6 +225,9 @@ data.
 * [Decreased the mutex lock
   scope](https://github.com/lightningnetwork/lnd/pull/7330) inside `ChannelRouter`.
 
+* [Add Custom Message to the fuzz testsuite
+in the lnwire package](https://github.com/lightningnetwork/lnd/pull/7303)
+
 ## `lncli`
 
 * [Add an `insecure` flag to skip tls auth as well as a `metadata` string slice
@@ -411,3 +414,4 @@ refactor the itest for code health and maintenance.
 * Tommy Volk
 * Yong Yu
 * Yusuke Shimizu
+* ziggie1984

lnwire/fuzz_test.go

@@ -807,3 +807,18 @@ func FuzzUpdateFulfillHTLC(f *testing.F) {
 		harness(t, data)
 	})
 }
+
+func FuzzCustomMessage(f *testing.F) {
+	f.Fuzz(func(t *testing.T, data []byte, customMessageType uint16) {
+		if customMessageType < uint16(CustomTypeStart) {
+			customMessageType += uint16(CustomTypeStart)
+		}
+
+		// Prefix with CustomMessage.
+		data = prefixWithMsgType(data, MessageType(customMessageType))
+
+		// Pass the message into our general fuzz harness for wire
+		// messages!
+		harness(t, data)
+	})
+}