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test that Suspense mode calls queryFn only once #325

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tannerlinsley merged 1 commit into from
May 1, 2020
+33 −0
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test that Suspense mode calls queryFn only once #325

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33 changes: 33 additions & 0 deletions src/tests/suspense.test.js
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Original file line number Diff line number Diff line change
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import { render, waitForElement, cleanup } from '@testing-library/react'
import * as React from 'react'

import { useQuery, queryCache } from '../index'
import { sleep } from './utils'

describe("useQuery's in Suspense mode", () => {
afterEach(() => {
queryCache.clear()
cleanup()
})

it('should not call the queryFn twice when used in Suspense mode', async () => {
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@simoncarpinter simoncarpinter Apr 6, 2020

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can remove the "when used in Suspense mode" bit, woops.

Suggested change
it('should not call the queryFn twice when used in Suspense mode', async () => {
it('should not call the queryFn twice', async () => {

const queryFn = jest.fn()
queryFn.mockImplementation(() => sleep(10))

function Page() {
useQuery(['test'], queryFn, { suspense: true })

return 'rendered'
}

const rendered = render(
<React.Suspense fallback="loading">
<Page />
</React.Suspense>
)

await waitForElement(() => rendered.getByText('rendered'))

expect(queryFn).toHaveBeenCalledTimes(1)
})
})