Error: Timeout of 2000ms exceeded. For async tests and hooks. Unit test with mocha and chai

While establishing the connection using socket

Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done( )" is called; if returning a Promise, ensure it resolves.

Given below is the code reference of the same

var socketOptions = {};
var socket = io.connect("http://localhost:5000", socketOptions);
socket.on('connect', function () {
     console.log('Connection Established');
     setTimeout(done, 500);
});

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