How to mock a node server with dummy port number and listen to it in jest test cases

function createAppServer(port){
server = app.listen(port,  () => {
 console.log('This is listening')
});
}

How to write unit test cases for the above code in Node Js with jest?

I tried creating a httpserver but it didn't work. Below is the jest code

test('It should return',()=>{
const httpServer = createServer();
httpServer.listen(async() => {
const port = httpServer.address().port;
await createAppServer(port);
});
});