Simple websocket client test

test_ws_client.js

$(document).ready(function() {
    const wsClient = new WebSocket("ws://localhost/ws");
    wsClient.onopen = function() {
        console.debug("Connected to server");
    };
    wsClient.onclose = function(evt) {
        console.debug("Closed: %o", evt);
    };
    wsClient.onmessage = function (evt) {
        console.debug("Rx: %o", evt.data);
    };
});