Is it possible to mock function in Jest / React / React testing library to get code coverage.

A simple example:

import React from 'react';

interface NewProps {
    children: React.ReactNode;
}

const handleClick = () => alert('hello');

const New: React.FunctionComponent<NewProps> = (props: NewProps) => {
    return (
        <h1 className="heading">{props.children}</h1>
        <button onClick={handleClick()}>Click</button>
    )
}

export default New;

So for example say I wanted to get coverage for the handleClick function, would I need to mock it?, I say this because some methods I have, are not as simple as this and to test them I was thinking of mocking the function, would that get the coverage?