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use-swr.test.tsx
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1715 lines (1502 loc) · 51.3 KB
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import {
act,
cleanup,
fireEvent,
render,
waitForDomChange
} from '@testing-library/react'
import React, { ReactNode, Suspense, useEffect, useState } from 'react'
import useSWR, { mutate, SWRConfig, trigger, cache } from '../src'
import Cache from '../src/cache'
class ErrorBoundary extends React.Component<{ fallback: ReactNode }> {
state = { hasError: false }
static getDerivedStateFromError() {
return {
hasError: true
}
}
render() {
if (this.state.hasError) {
return this.props.fallback
}
return this.props.children
}
}
describe('useSWR', () => {
afterEach(cleanup)
it('should return `undefined` on hydration', () => {
function Page() {
const { data } = useSWR('constant-1', () => 'SWR')
return <div>hello, {typeof data === 'undefined' ? '' : 'ERROR'}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
})
it('should return data after hydration', async () => {
function Page() {
const { data } = useSWR('constant-2', () => 'SWR')
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, SWR"`
)
})
it('should allow functions as key and reuse the cache', async () => {
function Page() {
const { data } = useSWR(() => 'constant-2', () => 'SWR')
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, SWR"`
)
})
it('should allow async fetcher functions', async () => {
function Page() {
const { data } = useSWR(
'constant-3',
() => new Promise(res => setTimeout(() => res('SWR'), 200))
)
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, SWR"`
)
})
it('should not call fetch function when revalidateOnMount is false', async () => {
const fetch = jest.fn(() => 'SWR')
function Page() {
const { data } = useSWR('revalidateOnMount', fetch, {
revalidateOnMount: false
})
return <div>hello, {data}</div>
}
render(<Page />)
expect(fetch).not.toHaveBeenCalled()
})
it('should call fetch function when revalidateOnMount is true even if initialData is set', async () => {
const fetch = jest.fn(() => 'SWR')
function Page() {
const { data } = useSWR('revalidateOnMount', fetch, {
revalidateOnMount: true,
initialData: 'gab'
})
return <div>hello, {data}</div>
}
render(<Page />)
expect(fetch).toHaveBeenCalled()
})
it('should dedupe requests by default', async () => {
let count = 0
const fetch = () => {
count++
return new Promise(res => setTimeout(() => res('SWR'), 200))
}
function Page() {
const { data: v1 } = useSWR('constant-4', fetch)
const { data: v2 } = useSWR('constant-4', fetch)
return (
<div>
{v1}, {v2}
</div>
)
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`", "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"SWR, SWR"`)
// only fetches once
expect(count).toEqual(1)
})
it('should trigger the onSuccess event', async () => {
let SWRData = null
function Page() {
const { data } = useSWR(
'constant-5',
() => new Promise(res => setTimeout(() => res('SWR'), 200)),
{ onSuccess: _data => (SWRData = _data) }
)
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, SWR"`
)
expect(SWRData).toEqual('SWR')
})
it('should broadcast data', async () => {
let cnt = 0
function Block() {
const { data } = useSWR('broadcast-1', () => cnt++, {
refreshInterval: 100,
// need to turn of deduping otherwise
// refreshing will be ignored
dedupingInterval: 10
})
return <>{data}</>
}
function Page() {
return (
<>
<Block /> <Block /> <Block />
</>
)
}
const { container } = render(<Page />)
await act(() => new Promise(res => setTimeout(res, 10)))
expect(container.textContent).toMatchInlineSnapshot(`"0 0 0"`)
await act(() => new Promise(res => setTimeout(res, 100)))
expect(container.textContent).toMatchInlineSnapshot(`"1 1 1"`)
await act(() => new Promise(res => setTimeout(res, 100)))
expect(container.textContent).toMatchInlineSnapshot(`"2 2 2"`)
})
it('should broadcast error', async () => {
let cnt = 0
function Block() {
const { data, error } = useSWR(
'broadcast-2',
() => {
if (cnt === 2) throw new Error('err')
return cnt++
},
{
refreshInterval: 100,
// need to turn of deduping otherwise
// refreshing will be ignored
dedupingInterval: 10
}
)
if (error) return error.message
return <>{data}</>
}
function Page() {
return (
<>
<Block /> <Block /> <Block />
</>
)
}
const { container } = render(<Page />)
await act(() => new Promise(res => setTimeout(res, 10)))
expect(container.textContent).toMatchInlineSnapshot(`"0 0 0"`)
await act(() => new Promise(res => setTimeout(res, 100)))
expect(container.textContent).toMatchInlineSnapshot(`"1 1 1"`)
await act(() => new Promise(res => setTimeout(res, 100)))
expect(container.textContent).toMatchInlineSnapshot(`"err err err"`)
})
it('should accept object args', async () => {
const obj = { v: 'hello' }
const arr = ['world']
function Page() {
const { data: v1 } = useSWR(
['args-1', obj, arr],
(a, b, c) => a + b.v + c[0]
)
// reuse the cache
const { data: v2 } = useSWR(['args-1', obj, arr], () => 'not called!')
// different object
const { data: v3 } = useSWR(
['args-2', obj, 'world'],
(a, b, c) => a + b.v + c
)
return (
<div>
{v1}, {v2}, {v3}
</div>
)
}
const { container } = render(<Page />)
await waitForDomChange({ container })
expect(container.textContent).toMatchInlineSnapshot(
`"args-1helloworld, args-1helloworld, args-2helloworld"`
)
})
it('should accept function returning args', async () => {
const obj = { v: 'hello' }
const arr = ['world']
function Page() {
const { data } = useSWR(
() => ['args-3', obj, arr],
(a, b, c) => a + b.v + c[0]
)
return <div>{data}</div>
}
const { container } = render(<Page />)
await waitForDomChange({ container })
expect(container.textContent).toMatchInlineSnapshot(`"args-3helloworld"`)
})
it('should accept initial data', async () => {
const fetcher = jest.fn(() => 'SWR')
function Page() {
const { data } = useSWR('initial-data-1', fetcher, {
initialData: 'Initial'
})
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(fetcher).not.toBeCalled()
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, Initial"`
)
})
it('should set config as second parameter', async () => {
const fetcher = jest.fn(() => 'SWR')
function Page() {
const { data } = useSWR('config-as-second-param', {
fetcher
})
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
expect(fetcher).toBeCalled()
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, SWR"`
)
})
})
describe('useSWR - loading', () => {
afterEach(cleanup)
const loadData = () => new Promise(res => setTimeout(() => res('data'), 100))
it('should return loading state', async () => {
let renderCount = 0
function Page() {
const { data, isValidating } = useSWR('is-validating-1', loadData)
renderCount++
return (
<div>
hello, {data}, {isValidating ? 'loading' : 'ready'}
</div>
)
}
const { container } = render(<Page />)
expect(container.textContent).toMatchInlineSnapshot(`"hello, , loading"`)
await waitForDomChange({ container })
expect(container.textContent).toMatchInlineSnapshot(`"hello, data, ready"`)
// data isValidating
// -> undefined, false
// -> undefined, true
// -> data, false
expect(renderCount).toEqual(3)
})
it('should avoid extra rerenders', async () => {
let renderCount = 0
function Page() {
// we never access `isValidating`, so it will not trigger rerendering
const { data } = useSWR('is-validating-2', loadData)
renderCount++
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
await waitForDomChange({ container })
expect(container.textContent).toMatchInlineSnapshot(`"hello, data"`)
// data
// -> undefined
// -> data
expect(renderCount).toEqual(2)
})
it('should avoid extra rerenders while fetching', async () => {
let renderCount = 0,
dataLoaded = false
const loadDataWithLog = () =>
new Promise(res =>
setTimeout(() => {
dataLoaded = true
res('data')
}, 100)
)
function Page() {
// we never access anything
useSWR('is-validating-3', loadDataWithLog)
renderCount++
return <div>hello</div>
}
const { container } = render(<Page />)
expect(container.textContent).toMatchInlineSnapshot(`"hello"`)
await act(() => new Promise(res => setTimeout(res, 110))) // wait
// it doesn't re-render, but fetch was triggered
expect(renderCount).toEqual(1)
expect(dataLoaded).toEqual(true)
})
})
describe('useSWR - refresh', () => {
afterEach(cleanup)
it('should rerender automatically on interval', async () => {
let count = 0
function Page() {
const { data } = useSWR('dynamic-1', () => count++, {
refreshInterval: 200,
dedupingInterval: 100
})
return <div>count: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 0"`)
await act(() => new Promise(res => setTimeout(res, 210))) // update
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 1"`)
await act(() => new Promise(res => setTimeout(res, 50))) // no update
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 1"`)
await act(() => new Promise(res => setTimeout(res, 150))) // update
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 2"`)
})
it('should dedupe requests combined with intervals', async () => {
let count = 0
function Page() {
const { data } = useSWR('dynamic-2', () => count++, {
refreshInterval: 200,
dedupingInterval: 300
})
return <div>count: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 0"`)
await act(() => new Promise(res => setTimeout(res, 210))) // no update (deduped)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 0"`)
await act(() => new Promise(res => setTimeout(res, 200))) // update
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 1"`)
await act(() => new Promise(res => setTimeout(res, 200))) // no update (deduped)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 1"`)
await act(() => new Promise(res => setTimeout(res, 200))) // update
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 2"`)
})
it('should update data upon interval changes', async () => {
let count = 0
function Page() {
const [int, setInt] = React.useState(200)
const { data } = useSWR('/api', () => count++, {
refreshInterval: int,
dedupingInterval: 100
})
return (
<div onClick={() => setInt(num => (num < 400 ? num + 100 : 0))}>
count: {data}
</div>
)
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 0"`)
await act(() => {
return new Promise(res => setTimeout(res, 210))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 1"`)
await act(() => {
return new Promise(res => setTimeout(res, 50))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 1"`)
await act(() => {
return new Promise(res => setTimeout(res, 150))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 2"`)
await act(() => {
fireEvent.click(container.firstElementChild)
// it will clear 200ms timer and setup a new 300ms timer
return new Promise(res => setTimeout(res, 200))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 2"`)
await act(() => {
return new Promise(res => setTimeout(res, 110))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 3"`)
await act(() => {
// wait for new 300ms timer
return new Promise(res => setTimeout(res, 310))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 4"`)
await act(() => {
fireEvent.click(container.firstElementChild)
// it will clear 300ms timer and setup a new 400ms timer
return new Promise(res => setTimeout(res, 300))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 4"`)
await act(() => {
return new Promise(res => setTimeout(res, 110))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 5"`)
await act(() => {
fireEvent.click(container.firstElementChild)
// it will clear 400ms timer and stop
return new Promise(res => setTimeout(res, 110))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 5"`)
await act(() => {
return new Promise(res => setTimeout(res, 110))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"count: 5"`)
})
it('should allow use custom isEqual method', async () => {
function Page() {
const { data, revalidate } = useSWR(
'dynamic-11',
() => ({
timestamp: +new Date(),
version: '1.0'
}),
{
compare: function isEqual(a, b) {
if (a === b) {
return true
}
if (!a || !b) {
return false
}
return a.version === b.version
}
}
)
if (!data) {
return <div>loading</div>
}
return <button onClick={revalidate}>{data.timestamp}</button>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"loading"`)
await waitForDomChange({ container })
const firstContent = container.firstChild.textContent
await act(() => {
// trigger revalidation
fireEvent.click(container.firstElementChild)
return new Promise(res => setTimeout(res, 1))
})
const secondContent = container.firstChild.textContent
expect(firstContent).toEqual(secondContent)
})
})
describe('useSWR - revalidate', () => {
afterEach(cleanup)
it('should rerender after triggering revalidation', async () => {
let value = 0
function Page() {
const { data, revalidate } = useSWR('dynamic-3', () => value++)
return <button onClick={revalidate}>data: {data}</button>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
await act(() => {
// trigger revalidation
fireEvent.click(container.firstElementChild)
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 1"`)
})
it('should revalidate all the hooks with the same key', async () => {
let value = 0
function Page() {
const { data: v1, revalidate } = useSWR('dynamic-4', () => value++)
const { data: v2 } = useSWR('dynamic-4', () => value++)
return (
<button onClick={revalidate}>
{v1}, {v2}
</button>
)
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`", "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"0, 0"`)
await act(() => {
// trigger revalidation
fireEvent.click(container.firstElementChild)
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"1, 1"`)
})
it('should respect sequences of revalidation calls (cope with race condition)', async () => {
let faster = false
function Page() {
const { data, revalidate } = useSWR(
'race',
() =>
new Promise(res => {
const value = faster ? 1 : 0
setTimeout(() => res(value), faster ? 100 : 200)
})
)
return <button onClick={revalidate}>{data}</button>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`""`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"0"`)
await act(async () => {
// trigger the slower revalidation
faster = false
fireEvent.click(container.firstElementChild)
await new Promise(res => setTimeout(res, 10))
// trigger the faster revalidation
faster = true
fireEvent.click(container.firstElementChild)
return new Promise(res => setTimeout(res, 210))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"1"`)
})
})
describe('useSWR - error', () => {
afterEach(cleanup)
it('should handle errors', async () => {
function Page() {
const { data, error } = useSWR(
'error-1',
() =>
new Promise((_, rej) =>
setTimeout(() => rej(new Error('error!')), 200)
)
)
if (error) return <div>{error.message}</div>
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error!"`)
})
it('should trigger the onError event', async () => {
let erroredSWR = null
function Page() {
const { data, error } = useSWR(
'error-2',
() =>
new Promise((_, rej) =>
setTimeout(() => rej(new Error('error!')), 200)
),
{ onError: (_, key) => (erroredSWR = key) }
)
if (error) return <div>{error.message}</div>
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error!"`)
expect(erroredSWR).toEqual('error-2')
})
it('should trigger error retry', async () => {
let count = 0
function Page() {
const { data, error } = useSWR(
'error-3',
() => {
return new Promise((_, rej) =>
setTimeout(() => rej(new Error('error: ' + count++)), 100)
)
},
{
onErrorRetry: (_, __, ___, revalidate, revalidateOpts) => {
setTimeout(() => revalidate(revalidateOpts), 100)
},
dedupingInterval: 0
}
)
if (error) return <div>{error.message}</div>
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error: 0"`)
await act(() => new Promise(res => setTimeout(res, 210))) // retry
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error: 1"`)
await act(() => new Promise(res => setTimeout(res, 210))) // retry
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error: 2"`)
})
it('should trigger the onLoadingSlow and onSuccess event', async () => {
let loadingSlow = null,
success = null
function Page() {
const { data } = useSWR(
'error-4',
() => new Promise(res => setTimeout(() => res('SWR'), 200)),
{
onLoadingSlow: key => (loadingSlow = key),
onSuccess: (_, key) => (success = key),
loadingTimeout: 100
}
)
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
expect(loadingSlow).toEqual(null)
await act(() => new Promise(res => setTimeout(res, 110))) // slow
expect(loadingSlow).toEqual('error-4')
expect(success).toEqual(null)
await act(() => new Promise(res => setTimeout(res, 100))) // finish
expect(success).toEqual('error-4')
expect(container.firstChild.textContent).toMatchInlineSnapshot(
`"hello, SWR"`
)
})
it('should trigger limited error retries if errorRetryCount exists', async () => {
let count = 0
function Page() {
const { data, error } = useSWR(
'error-5',
() => {
return new Promise((_, rej) =>
setTimeout(() => rej(new Error('error: ' + count++)), 100)
)
},
{
errorRetryCount: 1,
errorRetryInterval: 50,
dedupingInterval: 0
}
)
if (error) return <div>{error.message}</div>
return <div>hello, {data}</div>
}
const { container } = render(<Page />)
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"hello, "`)
await waitForDomChange({ container })
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error: 0"`)
await act(() => new Promise(res => setTimeout(res, 210))) // retry
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error: 1"`)
await act(() => new Promise(res => setTimeout(res, 210))) // retry
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"error: 1"`)
})
it('should not trigger the onLoadingSlow and onSuccess event after component unmount', async () => {
let loadingSlow = null,
success = null
function Page() {
const { data } = useSWR(
'error-6',
() => new Promise(res => setTimeout(() => res('SWR'), 200)),
{
onLoadingSlow: key => {
loadingSlow = key
},
onSuccess: (_, key) => {
success = key
},
loadingTimeout: 100
}
)
return <div>{data}</div>
}
function App() {
const [on, toggle] = useState(true)
return (
<div id="app" onClick={() => toggle(s => !s)}>
{on && <Page />}
</div>
)
}
const { container } = render(<App />)
expect(loadingSlow).toEqual(null)
expect(success).toEqual(null)
await act(async () => new Promise(res => setTimeout(res, 10)))
await act(() => fireEvent.click(container.firstElementChild))
await act(async () => new Promise(res => setTimeout(res, 200)))
expect(success).toEqual(null)
expect(loadingSlow).toEqual(null)
})
it('should not trigger the onError and onErrorRetry event after component unmount', async () => {
let retry = null,
failed = null
function Page() {
const { data } = useSWR(
'error-7',
() =>
new Promise((_, rej) =>
setTimeout(() => rej(new Error('error!')), 200)
),
{
onError: (_, key) => {
failed = key
},
onErrorRetry: (_, key) => {
retry = key
},
dedupingInterval: 0
}
)
return <div>{data}</div>
}
function App() {
const [on, toggle] = useState(true)
return (
<div id="app" onClick={() => toggle(s => !s)}>
{on && <Page />}
</div>
)
}
const { container } = render(<App />)
expect(retry).toEqual(null)
expect(failed).toEqual(null)
await act(async () => new Promise(res => setTimeout(res, 10)))
await act(() => fireEvent.click(container.firstElementChild))
await act(async () => new Promise(res => setTimeout(res, 200)))
expect(retry).toEqual(null)
expect(failed).toEqual(null)
})
})
describe('useSWR - focus', () => {
afterEach(cleanup)
it('should revalidate on focus by default', async () => {
let value = 0
function Page() {
const { data } = useSWR('dynamic-5', () => value++, {
dedupingInterval: 0
})
return <div>data: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
await act(() => {
// trigger revalidation
fireEvent.focus(window)
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 1"`)
})
it("shouldn't revalidate on focus when revalidateOnFocus is false", async () => {
let value = 0
function Page() {
const { data } = useSWR('dynamic-6', () => value++, {
dedupingInterval: 0,
revalidateOnFocus: false
})
return <div>data: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
await act(() => {
// trigger revalidation
fireEvent.focus(window)
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
})
})
describe('useSWR - local mutation', () => {
afterEach(cleanup)
it('should trigger revalidation programmatically', async () => {
let value = 0
function Page() {
const { data } = useSWR('dynamic-7', () => value++, {
dedupingInterval: 0
})
return <div>data: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
await act(() => {
// trigger revalidation
trigger('dynamic-7')
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 1"`)
})
it('should trigger revalidation programmatically within a dedupingInterval', async () => {
let value = 0
function Page() {
const { data } = useSWR('dynamic-12', () => value++, {
dedupingInterval: 2000
})
return <div>data: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
await act(() => {
// trigger revalidation
trigger('dynamic-12')
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 1"`)
})
it('should mutate the cache and revalidate', async () => {
let value = 0
function Page() {
const { data } = useSWR('dynamic-8', () => value++, {
dedupingInterval: 0
})
return <div>data: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 0"`)
await act(() => {
// mutate and revalidate
mutate('dynamic-8', 'mutate')
return new Promise(res => setTimeout(res, 1))
})
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: 1"`)
})
it('should dedupe extra requests after mutation', async () => {
let value = 0
function Page() {
const { data } = useSWR('dynamic-13', () => value++, {
dedupingInterval: 2000
})
useSWR('dynamic-13', () => value++, {
dedupingInterval: 2000
})
return <div>data: {data}</div>
}
const { container } = render(<Page />)
// hydration
expect(container.firstChild.textContent).toMatchInlineSnapshot(`"data: "`)
await waitForDomChange({ container }) // mount