Go testing websockets

I am trying to write testing for my chat API in go, but I am pretty new to testing in go. I can’t find proper examples on how to test more complex functions. For example I have this function where I send messages from a particular websocket to the broadcast channel, however I can’t imagine a way to test it. Could someone help me? here is the function:

func sendMessages(ws *websocket.Conn){
for {
	var msg Message
	// Read in a new message as JSON and map it to a Message object
	err := ws.ReadJSON(&msg)
	if err != nil {
		log.Printf("error: %v", err)
		delete(clients, ws)
	// Send the newly received message to the broadcast channel
	broadcast <- msg


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