utils is not defined and Expected undefined to be function

Question

"I'm trying to cover my default function through to jasmine. But facing issue with dependency files where jasmine is unable to took reference of those dependency. Getting 1 error utils is not defined and 2 error Expected undefined to be function".

"I tried to create mock data for utils is not defined and second i didn't try. But i was able to reproduce second error after comment utils line and that is for x storage."

const default = (newu) => {
    newu.isPay = utils.isPayUser(b$.portal.loggedInUserRole);
    xStorage.getItem('Id').then(value => {
      newu.successResponse.bId = value;
      newu.bId = newu.successResponse.bId.replace(/-/g, "");
      newu.bId = newu.bId.slice(0, -10);
    });
  }

describe('default', () => {
  it('default is defined', () => {
    let yesValue = true;
    let utils = {
      isPayUser:(yesValue)=>{}
      } 
    expect(default(ctrl)).toBeFunction();     
  });

});

"How i can cover functions with third party dependencies. Do we write some mock data and if yes what would be the way to write it. Utils and xstorage is a function and coming from dependency files which i already imported in my js file. This method will returns me true “utils.isPayUser(b$.portal.loggedInUserRole);” and xstorage return me get item. Xstorage is a method where we can store a value and whenever or wherever can access to get that value as like as sessionstorage."