Unit tests with JEST, on Node.Js, without using module.Exports in Javascript code files

Question

With both files below (ePar.js and ePar.test.js) in the same folder, how to perform the unit test, with the JEST, via Node.Js, of function ePar (in the archive ePar.js) WITHOUT ALTERING THE SAME?

I know adding module.exports = ePar; at the end of the archive ePar.js everything will work as expected. But how to perform the test in it, with JEST, without changing it?

Without changing it, is returning the error:

Typeerror: epar is not a Function

Below the code of the files:

file: epar.js

var ePar = function(num){ 
    return ((num % 2) === 0) ;
}

file: epar.test.js

var ePar = require('./ePar');

test('Testando função que informa se um número é par ou não', () => {
    let ar_dados = [

        //falsos
        {"input": 1, "valido": false},
        {"input": 3, "valido": false},
        {"input": 5, "valido": false},
        {"input": 15, "valido": false},
        {"input": 5579, "valido": false},

        // verdadeiros
        {"input": 2, "valido": true},
        {"input": 4, "valido": true},
        {"input": 10, "valido": true},
        {"input": 654896, "valido": true}
    ];

    for (let i = 0; i < ar_dados.length; i++) {
        expect(ePar(ar_dados[i].input)).toBe(ar_dados[i].valido);
    }
});

From now on, I appreciate any help!