Not able to mock a function inside useEffect

I have a custom hook as below

export const useUserSearch = () => {
const [options, setOptions] = useState([])
const [searchString, setSearchString] = useState('')
const [userSearch] = useUserSearchMutation()
useEffect(() => {
    if (searchString.trim().length > 3) {
        const searchParams = {
            orgId: '1',
            userId: '1',
            searchQuery: searchString.trim(),
        }
        userSearch(searchParams)
            .then((data) => {
                setOptions(data)
            })
            .catch((err) => {
                setOptions([])
                console.log('error', err)
            })
    }
}, [searchString, userSearch])
return {
    options,
    setSearchString,
}

}

and i want to test this hook but not able to mock userSearch function which is being called inside useEffect. can anybody help? this is my test

it('should set state and test function', async () => {
    const wrapper = ({ children }) => (
        <Provider store={store}>{children}</Provider>
    )
    const { result } = renderHook(
        () => useUserSearch(),
        { wrapper }
    )
    await act(async () => {
        result.current.setSearchString('abc5')
    })
    expect(result.current.options).toEqual(expected)
})

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