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ssr-hydration.test.tsx
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ssr-hydration.test.tsx
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import React from 'react'
import ReactDOM from 'react-dom'
import ReactDOMServer from 'react-dom/server'
import {
useQuery,
QueryClient,
QueryClientProvider,
QueryCache,
dehydrate,
hydrate,
} from '../..'
import * as utils from '../../core/utils'
import { mockConsoleError, sleep } from './utils'
// This monkey-patches the isServer-value from utils,
// so that we can pretend to be in a server environment
function setIsServer(isServer: boolean) {
// @ts-ignore
utils.isServer = isServer
}
async function fetchData<TData>(value: TData, ms?: number): Promise<TData> {
await sleep(ms || 1)
return value
}
function PrintStateComponent({ componentName, result }: any): any {
return `${componentName} - status:${result.status} fetching:${result.isFetching} data:${result.data}`
}
describe('Server side rendering with de/rehydration', () => {
it('should not mismatch on success', async () => {
const consoleMock = mockConsoleError()
const fetchDataSuccess = jest.fn(fetchData)
// -- Shared part --
function SuccessComponent() {
const result = useQuery('success', () => fetchDataSuccess('success!'))
return (
<PrintStateComponent componentName="SuccessComponent" result={result} />
)
}
// -- Server part --
setIsServer(true)
const prefetchCache = new QueryCache()
const prefetchClient = new QueryClient({ queryCache: prefetchCache })
await prefetchClient.prefetchQuery('success', () =>
fetchDataSuccess('success')
)
const dehydratedStateServer = dehydrate(prefetchClient)
const renderCache = new QueryCache()
const renderClient = new QueryClient({ queryCache: renderCache })
hydrate(renderClient, dehydratedStateServer)
const markup = ReactDOMServer.renderToString(
<QueryClientProvider client={renderClient}>
<SuccessComponent />
</QueryClientProvider>
)
const stringifiedState = JSON.stringify(dehydratedStateServer)
renderClient.clear()
setIsServer(false)
const expectedMarkup =
'SuccessComponent - status:success fetching:true data:success'
expect(markup).toBe(expectedMarkup)
// -- Client part --
const el = document.createElement('div')
el.innerHTML = markup
const queryCache = new QueryCache()
const queryClient = new QueryClient({ queryCache })
hydrate(queryClient, JSON.parse(stringifiedState))
ReactDOM.hydrate(
<QueryClientProvider client={queryClient}>
<SuccessComponent />
</QueryClientProvider>,
el
)
// Check that we have no React hydration mismatches
expect(consoleMock).not.toHaveBeenCalled()
expect(fetchDataSuccess).toHaveBeenCalledTimes(1)
expect(el.innerHTML).toBe(expectedMarkup)
ReactDOM.unmountComponentAtNode(el)
consoleMock.mockRestore()
queryClient.clear()
})
it('should not mismatch on error', async () => {
const consoleMock = mockConsoleError()
const fetchDataError = jest.fn(() => {
throw new Error('fetchDataError')
})
// -- Shared part --
function ErrorComponent() {
const result = useQuery('error', () => fetchDataError(), { retry: false })
return (
<PrintStateComponent componentName="ErrorComponent" result={result} />
)
}
// -- Server part --
setIsServer(true)
const prefetchCache = new QueryCache()
const prefetchClient = new QueryClient({ queryCache: prefetchCache })
await prefetchClient.prefetchQuery('error', () => fetchDataError())
const dehydratedStateServer = dehydrate(prefetchClient)
const renderCache = new QueryCache()
const renderClient = new QueryClient({ queryCache: renderCache })
hydrate(renderClient, dehydratedStateServer)
const markup = ReactDOMServer.renderToString(
<QueryClientProvider client={renderClient}>
<ErrorComponent />
</QueryClientProvider>
)
const stringifiedState = JSON.stringify(dehydratedStateServer)
renderClient.clear()
setIsServer(false)
const expectedMarkup =
'ErrorComponent - status:loading fetching:true data:undefined'
expect(markup).toBe(expectedMarkup)
// -- Client part --
const el = document.createElement('div')
el.innerHTML = markup
const queryCache = new QueryCache()
const queryClient = new QueryClient({ queryCache })
hydrate(queryClient, JSON.parse(stringifiedState))
ReactDOM.hydrate(
<QueryClientProvider client={queryClient}>
<ErrorComponent />
</QueryClientProvider>,
el
)
// We expect exactly one console.error here, which is from the
expect(consoleMock).toHaveBeenCalledTimes(1)
expect(fetchDataError).toHaveBeenCalledTimes(1)
expect(el.innerHTML).toBe(expectedMarkup)
await sleep(50)
expect(fetchDataError).toHaveBeenCalledTimes(2)
expect(el.innerHTML).toBe(
'ErrorComponent - status:error fetching:false data:undefined'
)
ReactDOM.unmountComponentAtNode(el)
consoleMock.mockRestore()
queryClient.clear()
})
it('should not mismatch on queries that were not prefetched', async () => {
const consoleMock = mockConsoleError()
const fetchDataSuccess = jest.fn(fetchData)
// -- Shared part --
function SuccessComponent() {
const result = useQuery('success', () => fetchDataSuccess('success!'))
return (
<PrintStateComponent componentName="SuccessComponent" result={result} />
)
}
// -- Server part --
setIsServer(true)
const prefetchCache = new QueryCache()
const prefetchClient = new QueryClient({ queryCache: prefetchCache })
const dehydratedStateServer = dehydrate(prefetchClient)
const renderCache = new QueryCache()
const renderClient = new QueryClient({ queryCache: renderCache })
hydrate(renderClient, dehydratedStateServer)
const markup = ReactDOMServer.renderToString(
<QueryClientProvider client={renderClient}>
<SuccessComponent />
</QueryClientProvider>
)
const stringifiedState = JSON.stringify(dehydratedStateServer)
renderClient.clear()
setIsServer(false)
const expectedMarkup =
'SuccessComponent - status:loading fetching:true data:undefined'
expect(markup).toBe(expectedMarkup)
// -- Client part --
const el = document.createElement('div')
el.innerHTML = markup
const queryCache = new QueryCache()
const queryClient = new QueryClient({ queryCache })
hydrate(queryClient, JSON.parse(stringifiedState))
ReactDOM.hydrate(
<QueryClientProvider client={queryClient}>
<SuccessComponent />
</QueryClientProvider>,
el
)
// Check that we have no React hydration mismatches
expect(consoleMock).not.toHaveBeenCalled()
expect(fetchDataSuccess).toHaveBeenCalledTimes(0)
expect(el.innerHTML).toBe(expectedMarkup)
await sleep(50)
expect(fetchDataSuccess).toHaveBeenCalledTimes(1)
expect(el.innerHTML).toBe(
'SuccessComponent - status:success fetching:false data:success!'
)
ReactDOM.unmountComponentAtNode(el)
consoleMock.mockRestore()
queryClient.clear()
})
})