Enzyme - Check whether a function of a Functional Component has been called

Question

I have an React project that had unit tests with Jest and Enzyme. Inside the component I want to create a unit test, I need to know if an internal function (myFunction in the example below) of the component was called, but as I am using Functional Component inves of class Component, I am not able to mock the function. What is the recommended way for me to mock? Export the function to import in the test?

const ModalContent = () => {
  const myFunction = () => {
    return 1 + 1;
  };

  useEffect(() => {
    myFunction();
  }, []);

  return <p className='modal-wrapper'>it's working</p>;
};

export default ModalContent;