aspnetcore/client-ts/Microsoft.AspNetCore.SignalR.Test.Server/wwwroot/js/webSocketTests.js

describe('WebSockets', function () {
    it('can be used to connect to SignalR', done => {
        const message = "message";

        let webSocket = new WebSocket(ECHOENDPOINT_URL.replace(/^http/, "ws") + '/ws');

        webSocket.onopen = () => {
            webSocket.send(message);
        };

        webSocket.onerror = event => {
            fail();
            done();
        };

        var received = "";
        webSocket.onmessage = event => {
            received += event.data;
            if (received === message) {
                webSocket.close();
            }
        };

        webSocket.onclose = event => {
            expect(event.wasClean).toBe(true);
            done();
        };
    });
});