Юнит-тестирование селекта material ui

  <Select
        id="language_select"
        value={currectLanguage}
        onChange={handleLanguageChange}
      >
        <MenuItem value={ENGLISH}>EN</MenuItem>
        <MenuItem value={RUSSIAN}>RU</MenuItem>
      </Select>

const handleLanguageChange = useCallback((event: SelectChangeEvent) => {
   current.language = event.target.value
  }, [])

const props = {
  onChange: jest.fn(),
}
it('should work onChange', () => {
  const component = shallow(<Select />)
  component.simulate('change', { target: { value: 'EN' } })
  component.update()
 
  expect(component.props().value).toBe('RU')
})

it('SHOULD invoke "onChange" WHEN user make something', () => {
  const onChange = jest.fn()
  const component = mount(<Select
        id="language_select"
        value={{currectLanguage: "RU"}}
        onChange={onChange}
      >
        <MenuItem value={ENGLISH}>EN</MenuItem>
        <MenuItem value={RUSSIAN}>RU</MenuItem>
      </Select>)
  component.simulate('click', component.find('EN'))
  component.update()
 
  expect(onChange).toHaveBeenCalledTimes(1)
  expect(onChange).toHaveBeenCalledWith({ value: 'EN' })
})