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use-swr-infinite.test.tsx
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use-swr-infinite.test.tsx
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import React, { Suspense, useEffect, useState } from 'react'
import { fireEvent, act, screen } from '@testing-library/react'
import useSWR, { mutate as globalMutate, useSWRConfig, SWRConfig } from 'swr'
import useSWRInfinite, { unstable_serialize } from 'swr/infinite'
import {
sleep,
createKey,
createResponse,
nextTick,
renderWithConfig,
renderWithGlobalCache,
executeWithoutBatching
} from './utils'
describe('useSWRInfinite', () => {
it('should render the first page component', async () => {
const key = createKey()
function Page() {
const { data, error, isValidating } = useSWRInfinite(
index => `page-${index}-${key}`,
infiniteKey => createResponse(infiniteKey)
)
return (
<div>
<div>data:{data}</div>
<div>error:{error}</div>
<div>isValidating:{isValidating.toString()}</div>
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText(`data:page-0-${key}`)
await screen.findByText(`error:`)
await screen.findByText(`isValidating:false`)
})
it('should not render anything if getKey throw error and call mutate wont cause error', async () => {
function Page() {
const { data, error, isValidating, mutate } = useSWRInfinite(
() => {
throw new Error('error')
},
infiniteKey => createResponse(infiniteKey)
)
return (
<div>
<div onClick={() => mutate()}>data:{data}</div>
<div>error:{error}</div>
<div>isValidating:{isValidating.toString()}</div>
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText(`data:`)
await screen.findByText(`error:`)
await screen.findByText(`isValidating:false`)
fireEvent.click(screen.getByText('data:'))
await screen.findByText(`data:`)
await screen.findByText(`error:`)
await screen.findByText(`isValidating:false`)
})
it('should render the multiple pages', async () => {
const key = createKey()
function Page() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => createResponse(`page ${index}, `)
)
useEffect(() => {
// load next page if the current one is ready
if (size <= 2) setSize(size + 1)
// The setSize function is guaranteed to be referential equal
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [size])
return <div>data:{data}</div>
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:page 0, page 1, page 2,')
})
it('should support mutate and initialSize', async () => {
// mock api
const pageData = ['apple', 'banana', 'pineapple']
const key = createKey()
function Page() {
const { data, mutate: boundMutate } = useSWRInfinite(
index => [key, index],
([_, index]) => createResponse(`${pageData[index]}, `),
{
initialSize: 3
}
)
return (
<div
onClick={() => {
// reload the entire list
boundMutate()
}}
>
data:{data}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:apple, banana, pineapple,')
// change the source data to 'watermelon'
pageData[1] = 'watermelon'
// revalidate
fireEvent.click(screen.getByText('data:apple, banana, pineapple,'))
await screen.findByText('data:apple, watermelon, pineapple,')
})
it('should support api cursor', async () => {
// an API that supports the `?offset=` param
async function mockAPIFetcher(url) {
const parse = url.match(/\?offset=(\d+)/)
const offset = parse ? +parse[1] + 1 : 0
const response =
offset <= 3
? [
{
data: 'foo',
id: offset
},
{
data: 'bar',
id: offset + 1
}
]
: []
return createResponse(response)
}
const key = createKey()
function Page() {
const { data } = useSWRInfinite(
(index, previousPageData) => {
// first page
if (index === 0) return `/api/${key}`
// hit the end
if (!previousPageData.length) {
return null
}
// fetch with offset
return `/api/${key}?offset=${
previousPageData[previousPageData.length - 1].id
}`
},
mockAPIFetcher,
{
initialSize: 5
}
)
if (!data) return <div>loading</div>
const hitEnd = data[data.length - 1].length === 0
return (
<div>
{data.map(page => {
return page.map(item => {
return (
<span key={item.id}>
{item.id}: {item.data},{' '}
</span>
)
})
})}
{hitEnd ? 'end.' : ''}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('loading')
await screen.findByText('0: foo,')
await screen.findByText('1: bar,')
await screen.findByText('2: foo,')
await screen.findByText('3: bar,')
await screen.findByText('end.')
})
it('should skip fetching existing pages when loading more', async () => {
let requests = 0
const key = createKey()
function Page() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => {
requests++
return createResponse(`page ${index}, `)
}
)
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:page 0,') // mounted
expect(requests).toEqual(1)
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,') // mounted
expect(requests).toEqual(3) // revalidate page 0, load page 1
// load next page
fireEvent.click(screen.getByText('data:page 0, page 1,'))
await screen.findByText('data:page 0, page 1, page 2,') // mounted
expect(requests).toEqual(5) // revalidate page 0, load page 2
// load next page
fireEvent.click(screen.getByText('data:page 0, page 1, page 2,'))
await screen.findByText('data:page 0, page 1, page 2, page 3,') // mounted
expect(requests).toEqual(7) // revalidate page 0, load page 3
})
it('should not revalidate page 0 when revalidateFirstPage is false', async () => {
let requests = 0
const key = createKey()
function Page() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => {
requests++
return createResponse(`page ${index}, `)
},
{
revalidateFirstPage: false
}
)
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:page 0,') // mounted
expect(requests).toEqual(1)
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,') // mounted
expect(requests).toEqual(2) // load page 1
// load next page
fireEvent.click(screen.getByText('data:page 0, page 1,'))
await screen.findByText('data:page 0, page 1, page 2,') // mounted
expect(requests).toEqual(3) // load page 2
// load next page
fireEvent.click(screen.getByText('data:page 0, page 1, page 2,'))
await screen.findByText('data:page 0, page 1, page 2, page 3,') // mounted
expect(requests).toEqual(4) // load page 3
})
it('should cache page count', async () => {
let toggle
const key = createKey()
function Page() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => createResponse(`page ${index}, `)
)
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
function App() {
const [showList, setShowList] = useState(true)
toggle = setShowList
return showList ? <Page /> : <div>yo</div>
}
renderWithConfig(<App />)
screen.getByText('data:')
await screen.findByText('data:page 0,')
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,')
// switch to another component
act(() => toggle(v => !v))
screen.getByText('yo')
// switch back and it should still have 2 pages cached
act(() => toggle(v => !v))
screen.getByText('data:page 0, page 1,')
await act(() => sleep(100))
screen.getByText('data:page 0, page 1,')
})
it('should reset page size when key changes', async () => {
let toggle
const key = createKey()
function Page() {
const [t, setT] = useState(false)
const { data, size, setSize } = useSWRInfinite(
index => [key, index, t ? 'A' : 'B'],
([_, index]) => createResponse(`page ${index}, `)
)
toggle = setT
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:page 0,')
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,')
// switch key, it should have only 1 page
act(() => toggle(v => !v))
await screen.findByText('data:page 0,')
})
it('should persist page size when key changes', async () => {
let toggle
const key = createKey()
function Page() {
const [t, setT] = useState(false)
const { data, size, setSize } = useSWRInfinite(
index => [key, index, t ? 'A' : 'B'],
async ([_, index]) => createResponse(`page ${index}, `),
{
persistSize: true
}
)
toggle = setT
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:page 0,')
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,')
// switch key, it should still have 2 pages
act(() => toggle(v => !v))
await screen.findByText('data:page 0, page 1,')
})
it('should persist page size when remount', async () => {
let toggle
const key = createKey()
function Comp() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => createResponse(`page ${index}, `)
)
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
function Page() {
const [show, setShow] = useState(true)
toggle = setShow
return show ? <Comp /> : <div>hide</div>
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:page 0,')
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,')
// pages should be unmounted now
act(() => toggle(v => !v))
await screen.findByText('hide')
// remount, should still have 2 pages
act(() => toggle(v => !v))
await screen.findByText('data:page 0, page 1,')
})
it('should keep `mutate` referential equal', async () => {
const setters = []
const key = createKey()
function Comp() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => createResponse(`page ${index}, `)
)
setters.push(setSize)
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{data}
</div>
)
}
renderWithConfig(<Comp />)
screen.getByText('data:')
await screen.findByText('data:page 0,')
// load next page
fireEvent.click(screen.getByText('data:page 0,'))
await screen.findByText('data:page 0, page 1,')
// check all `setSize`s are referential equal.
for (const setSize of setters) {
expect(setSize).toEqual(setters[0])
}
})
it('should share initial cache from `useSWR`', async () => {
const cachedData = new Date().toISOString()
const key = createKey()
globalMutate(`shared-cache-${key}-0`, cachedData)
function Page() {
const { data } = useSWRInfinite<string, string>(
index => `shared-cache-${key}-${index}`,
() => createResponse(cachedData)
)
return <div>data:{data}</div>
}
renderWithGlobalCache(<Page />)
screen.getByText('data:')
// after a rerender we should already have the cached data rendered
await screen.findByText(`data:${cachedData}`)
})
it('should not break refreshInterval', async () => {
let value = 0
const key = createKey()
function Page() {
const { data } = useSWRInfinite(
index => `interval-${key}-${index}`,
() => value++,
{
dedupingInterval: 0,
refreshInterval: 100
}
)
return <div>data:{data}</div>
}
renderWithConfig(<Page />)
screen.getByText('data:')
// after 300ms the rendered result should be 3
await executeWithoutBatching(() => sleep(350))
screen.getByText('data:3')
})
it('should re-use fallbackData', async () => {
const dummyResponses = {
'/api?page=1': ['page-1-1', 'page-1-2'],
'/api?page=2': ['page-2-1', 'page-2-2']
}
const requests = []
const key = createKey()
function Page() {
const { data, size, setSize } = useSWRInfinite(
index => {
return [key, `/api?page=${index + 1}`]
},
([_, index]) => {
requests.push(index)
return createResponse<string[]>(dummyResponses[index])
},
{
fallbackData: [dummyResponses[`/api?page=1`]]
}
)
return (
<div
onClick={() => {
// load next page
setSize(size + 1)
}}
>
data:{(data ? [].concat(...data) : []).join(', ')}
</div>
)
}
renderWithConfig(<Page />)
// render with the fallbackData
screen.getByText('data:page-1-1, page-1-2')
expect(requests).toEqual([]) // should use the initial data
fireEvent.click(screen.getByText('data:page-1-1, page-1-2'))
// Should this reuse the cached data for `page=1`?
await screen.findByText('data:page-1-1, page-1-2, page-2-1, page-2-2')
expect(requests).toEqual(['/api?page=1', '/api?page=2'])
})
it('should share data between multiple hooks have the same key', async () => {
const key = createKey()
const dummyResponses = {
'/api?page=1': ['page-1-1', 'page-1-2'],
'/api?page=2': ['page-2-1', 'page-2-2']
}
const useCustomSWRInfinite = () => {
const { data, setSize, size } = useSWRInfinite(
index => [key, `/api?page=${index + 1}`],
([_, index]) => createResponse<string[]>(dummyResponses[index])
)
return {
data: data ? [].concat(...data) : [],
setSize,
size
}
}
const Component = (props: { label: string }) => {
const { data, size, setSize } = useCustomSWRInfinite()
return (
<>
<ul>
{data.map(value => (
<li key={value}>
{props.label}:{value}
</li>
))}
</ul>
<button onClick={() => setSize(size + 1)}>{props.label}:click</button>
</>
)
}
function Page() {
return (
<div>
<Component label="A" />
<Component label="B" />
</div>
)
}
renderWithConfig(<Page />)
// render responses for page=1
await screen.findByText('A:page-1-2')
await screen.findByText('B:page-1-2')
fireEvent.click(screen.getByText('A:click'))
// render responses for page=2
await screen.findByText('A:page-2-2')
await screen.findByText('B:page-2-2')
})
it('should support null as getKey', async () => {
function Page() {
const { data, setSize } = useSWRInfinite(null, () => 'data')
return (
<div
onClick={() => {
// load next page
setSize(size => size + 1)
}}
>
data:{data || ''}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:')
// load next page
fireEvent.click(screen.getByText('data:'))
await screen.findByText('data:')
})
it('should support getKey to return null', async () => {
function Page() {
const { data, setSize } = useSWRInfinite(
() => null,
() => 'data'
)
return (
<div
onClick={() => {
// load next page
setSize(size => size + 1)
}}
>
data:{data || ''}
</div>
)
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText('data:')
// load next page
fireEvent.click(screen.getByText('data:'))
await screen.findByText('data:')
})
it('should mutate a cache with `unstable_serialize`', async () => {
let count = 0
const key = createKey()
let mutate
function Page() {
mutate = useSWRConfig().mutate
const { data } = useSWRInfinite(
index => `page-test-${key}-${index}`,
infiniteKey => createResponse(`${infiniteKey}:${++count}`)
)
return <div>data:{data}</div>
}
renderWithConfig(<Page />)
screen.getByText('data:')
await screen.findByText(`data:page-test-${key}-0:1`)
await act(() =>
mutate(unstable_serialize(index => `page-test-${key}-${index}`))
)
await screen.findByText(`data:page-test-${key}-0:2`)
await act(() =>
mutate(
unstable_serialize(index => `page-test-${key}-${index}`),
'local-mutation',
false
)
)
await screen.findByText('data:local-mutation')
})
it('should mutate a cache with `unstable_serialize` based on a current data', async () => {
const key = createKey()
const getKey: (index: number) => [string, number] = (index: number) => [
key,
index
]
let mutate
function Comp() {
mutate = useSWRConfig().mutate
const { data, size, setSize } = useSWRInfinite(getKey, ([_, index]) =>
createResponse(`page ${index}, `)
)
useEffect(() => {
setSize(size + 1)
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [])
return <div>data:{data}</div>
}
renderWithConfig(<Comp />)
screen.getByText('data:')
await screen.findByText('data:page 0, page 1,')
await act(() =>
mutate(
unstable_serialize(getKey),
data => data.map(value => `(edited)${value}`),
false
)
)
await screen.findByText('data:(edited)page 0, (edited)page 1,')
})
it('should be able to use `unstable_serialize` with a custom cache', async () => {
const key = createKey()
let mutateCustomCache
function Page() {
mutateCustomCache = useSWRConfig().mutate
const { data } = useSWRInfinite(
() => key,
() => createResponse('response data')
)
return <div>data:{data}</div>
}
function App() {
return (
<SWRConfig
value={{
provider: () => new Map([[key, { data: 'initial-cache' }]])
}}
>
<Page />
</SWRConfig>
)
}
renderWithConfig(<App />)
screen.getByText('data:')
await screen.findByText('data:initial-cache')
await act(() => mutateCustomCache(unstable_serialize(() => key)))
await screen.findByText('data:response data')
await act(() =>
mutateCustomCache(
unstable_serialize(() => key),
'local-mutation',
false
)
)
await screen.findByText('data:local-mutation')
})
it('should correctly set size when key is null', async () => {
const loggedValues = []
function Page() {
const { size, setSize } = useSWRInfinite(
() => null,
() => ''
)
loggedValues.push(size)
return <button onClick={() => setSize(1)}>set size</button>
}
renderWithConfig(<Page />)
await screen.findByText('set size')
fireEvent.click(screen.getByText('set size'))
await nextTick()
expect(loggedValues).toEqual([1])
})
it('setSize should only accept number', async () => {
const key = createKey()
function Comp() {
const { data, size, setSize } = useSWRInfinite(
index => [key, index],
([_, index]) => createResponse(`page ${index}`)
)
return (
<>
<div
onClick={() => {
// load next page
// @ts-ignore
setSize('2')
}}
>
data:{data}
</div>
<div>size:{size}</div>
</>
)
}
renderWithConfig(<Comp></Comp>)
await screen.findByText('data:page 0')
await screen.findByText('size:1')
fireEvent.click(screen.getByText('data:page 0'))
await screen.findByText('data:page 0')
await screen.findByText('size:1')
})
it('should correctly set size when setSize receives a callback', async () => {
const key = createKey()
function Page() {
const { data, size, setSize } = useSWRInfinite(
index => `${key}-${index}`,
k => createResponse(`page-${k}`)
)
return (
<div>
<p>data: {(data || []).join()}</p>
<p>size: {size}</p>
<button onClick={() => setSize(sz => sz + 1)}>set size</button>
</div>
)
}
const getDataBySize = size =>
Array<string>(size)
.fill('')
.map((_, index) => `page-${key}-${index}`)
.join()
renderWithConfig(<Page />)
await screen.findByText('set size')
const btn = screen.getByText('set size')
fireEvent.click(btn)
await nextTick()
await screen.findByText(`data: ${getDataBySize(2)}`)
await screen.findByText('size: 2')
fireEvent.click(btn)
await nextTick()
await screen.findByText(`data: ${getDataBySize(3)}`)
await screen.findByText('size: 3')
})
// https://github.com/vercel/swr/issues/908
//TODO: This test trigger act warning
it('should revalidate first page after mutating', async () => {
let renderedData
const key = createKey()
let v = 'old'
function Page() {
const {
data,
size,
mutate: boundMutate
} = useSWRInfinite(
i => [key, i],
() => v
)
renderedData = data
return (
<div>
<button
onClick={() => {
v = 'new'
boundMutate([v])
}}
>
mutate
</button>
<p>size=${size}</p>
</div>
)
}
renderWithConfig(<Page />)
await screen.findByText('mutate')
await nextTick()
expect(renderedData).toEqual(['old'])
fireEvent.click(screen.getByText('mutate'))
await nextTick()
expect(renderedData).toEqual(['new'])
})
it('should reuse cached value for new pages', async () => {
const key = createKey()
function Page() {
const { data, setSize } = useSWRInfinite(
index => key + '-' + index,
() => createResponse('response value')
)
return (
<div onClick={() => setSize(2)}>data:{data ? data.join(',') : ''}</div>
)
}
renderWithConfig(<Page />, {
provider: () => new Map([[key + '-1', { data: 'cached value' }]])
})
screen.getByText('data:')
await screen.findByText('data:response value')
fireEvent.click(screen.getByText('data:response value'))
await screen.findByText('data:response value,cached value')
})
it('should return cached value ASAP when updating size and revalidate in the background', async () => {
const key = createKey()
const getData = jest.fn(v => v)
function Page() {
const { data, setSize } = useSWRInfinite(
index => key + '-' + index,