how to test javascript in node repl (no browser)

I have file mycode.js and mycode.test.js. I want to test it in Node console (repl) - (no browser), in karma style - mycode.test.js looks as below:

var expect = require('expect');
var mycode = require("./mycode");

describe("mycode", () => {
    it("should properly run tests", () => {
        expect(1).toBe(1);
    });
});

what is the simplest possible setup to achieve this?

via mtx