How to test it with Jest?

[DonHuskini]

Tried to mock getCookie with jest.spyOn however it throws an error Cannot spyOn on a primitive value; undefined given. Any idea how to make it work?

import Cookies from 'cookies-next'
jest.spyOn(Cookies, 'getCookie').mockReturnValueOnce('c')

Also tried importing with require and didn't work.

Also tried to mock the module and didn't work:

import Cookies from 'cookies-next'

jest.mock('cookies-next', () => ({
  getCookie: jest.fn(),
  setCookie: jest.fn()
}))

test(() => {
  (Cookies.getCookie as jest.Mock).mockReturnValue('c')
})

Also tried to to use the mockResolvedValueOnce to return different values when called and didn't work:

jest.mock('cookies-next', () => ({
  getCookie: jest.fn().mockResolvedValueOnce('a').mockResolvedValueOnce('c'),
  setCookie: jest.fn()
}))