Ref variable in react unit test

Question

Good morning Guys, I'm new with react unit test, right now I'm trying to do unit test for a input file, I have done a simple unit test for a button and works properly, but in this case the I'm not quite sure how use the ref variable in the unit test(Jest), any advice please.

import React, { useRef } from "react";
import { Route, Redirect } from "react-roter-dom";


const FileInput = ({name})=>{
    const fileRef= useRef(null);

    return(
        <input 
        type='File'
        name={name}
        ref={(e) => {
            register(e);
            fileRef.current = e;
        }} />  

    );
}

export default FileInput;