Mocha Enzyme - how to check if element created by ajax exist

My select component is like below

class Select extends React.component(){
    render(){
        return(
            <select>
                some options return by ajax appended in here
            </select>
        )
    }
}

How to check if select have some option in it after it has been updated by other ajax function

My test tools consist of mocha, enzyme, chai and sinon