非同期コールバック用のJestテストケースでの非同期タイムアウトの解決方法

exports.getValidData = function(){
return new Promise(function(resolve, reject){
    const payloadData = {
        'user_id': userid,
    };

    const res = await fetch('https://<token-url>',{
        method: 'POST',
        headers: {
            'Accept': 'application/json'
        },
        body: new URLSearchParams(payloadData )
    });

    if(res.status != 200){
        reject(res.message);
    }
    let responseData = await res.json();
    resolve(responseData);

});
}

const dataTest = require("../data");
it("Test case for function getValidData", async()=>{
   await dataTest.getValidData().then(res => {
       expect(res).not.tobeNull();
   }).catch(err => {

   });
}, 30000);