What value to give void properties

I have this interface:

interface Props {
    close: () => void;
    disableButton: () => void;
    showPrompt: boolean;
    pol: string;
}

I’m trying to use it in a test. My problem is that I don’t know what I should do with close and disableButton. They are just passed to that class so the state can be updated. What value do I give the variables for use in my shallow?

describe('<Reissue />', () => {
    it('calls reissue service', () => {
        const close = ???;
        const disableButton = ???;
        const showPrompt = true;
        const pol = '123456';

        const wrapper = shallow(<Reissue close={} disableButton={} showPrompt={showPrompt} pol={pol}/>);
    });    
});

>Solution :

close and disableButton are functions so you should pass functions to them, even if empty empty ones –

const wrapper = shallow(<Reissue close={()=>()} disableButton={()=>()} showPrompt={showPrompt} pol={pol}/>);