How do I test a debounce function using mocha in javascript?

How do I test a debounce function using mocha in javascript?

const debounce = (func, delay)  => {
    let timout;
    return function() {
        const context = this, args = arguments;
        clearTimeout(timout);
        timout = setTimeout(() => {
            func.apply(context, args);
        }, delay);
    };
};