React Native: 'Jest did not exit one second after the test run has completed' with #testing-library/react-hooks and react-query - react-native

Question

I am using jest and #testing-library/react-hooks to test hooks implemented with react-query in my React Native code.
The tests work ok, but at the end, I am getting:
Jest did not exit one second after the test run has completed.
This usually means that there are asynchronous operations that weren't stopped in your tests. Consider running Jest with `--detectOpenHandles` to troubleshoot this issue.
Here is my simplified code:
import { renderHook } from '#testing-library/react-hooks'
import React from 'react'
import { QueryClient, QueryClientProvider, useQuery } from 'react-query'
const useSomething = () => {
return useQuery('myquery', () => 'OK')
}
beforeAll((done) => {
done()
})
afterAll((done) => {
done()
})
// test cases
describe('Testing something', () => {
it('should do something', async () => {
const queryClient = new QueryClient()
const wrapper = ({ children }: { children: React.ReactFragment }) => (
<QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
)
const { result, waitFor } = renderHook(() => useSomething(), { wrapper })
await waitFor(() => {
return result.current.isSuccess
})
expect(result.current.data).toBe('OK')
})
})
I tried using cleanup, done, unmount, etc. before each/all with no results. If I remove useQuery from useSomething, the problem disappears.
Any idea how to fix it?

Answer 1

This issue has been reported in the past here:
https://github.com/tannerlinsley/react-query/issues/1847
The issue is caused by the react-query garbage collection timer running, which defaults to 5 minutes. Solutions are, as described in the issue:
clearing the queryCache after each test:
afterEach(() => { queryClient.clear() });
setting cacheTime to 0 for your test, e.g. with: queryClient.setDefaultOptions({ queries: { cacheTime: 0 } })
using jest.useFakeTimers()

Answer 2

You could try defining a function like:
export function flushPromises() {
return new Promise((resolve) => setImmediate(resolve));
}
Then on your test before the expect:
await flushPromises();
More info here