ladybird/Tests/LibWeb/Text/input/WebSocket/echo.html

<script src="../include.js"></script>
<script>
    asyncTest((done) => {
        const ws = new WebSocket('wss://echo.websocket.org');

        let messageCount = 0;

        ws.onopen = function (ev) {
            println(ev.type);

            ws.onclose = function (ev) {
                println(ev.type);
                done();
            }
            ws.onerror = function (ev) {
                println(ev.type);
                done();
            }
        };
        ws.onmessage = function (ev) {
            if (ev.data.startsWith('WellHelloFriends')) {
                println(`${ev.type} ${ev.data}`)
            }

            ws.send(`WellHelloFriends${messageCount}`);
            if (messageCount++ === 5) {
                ws.close();
            }
        }
        ws.onerror = function (ev) {
            println(ev.type);
            done();
        }
    });
</script>