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react-code-dataset / next.js /test /e2e /app-dir /app-prefetch /prefetching.stale-times.test.ts
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import { nextTestSetup } from 'e2e-utils'
import { retry, waitFor } from 'next-test-utils'
describe('app dir - prefetching (custom staleTime)', () => {
const { next, isNextDev } = nextTestSetup({
files: __dirname,
skipDeployment: true,
nextConfig: {
experimental: {
staleTimes: {
static: 10,
dynamic: 5,
},
},
},
})
if (isNextDev) {
it('should skip next dev for now', () => {})
return
}
it('should not fetch again when a static page was prefetched when navigating to it twice', async () => {
const browser = await next.browser('/404')
let requests: string[] = []
browser.on('request', (req) => {
requests.push(new URL(req.url()).pathname)
})
await browser.eval('location.href = "/"')
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(1)
})
await browser
.elementByCss('#to-static-page')
.click()
.waitForElementByCss('#static-page')
await browser
.elementByCss('#to-home')
// Go back to home page
.click()
// Wait for homepage to load
.waitForElementByCss('#to-static-page')
// Click on the link to the static page again
.click()
// Wait for the static page to load again
.waitForElementByCss('#static-page')
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(1)
})
})
it('should fetch again when a static page was prefetched when navigating to it after the stale time has passed', async () => {
const browser = await next.browser('/404')
let requests: string[] = []
browser.on('request', (req) => {
requests.push(new URL(req.url()).pathname)
})
await browser.eval('location.href = "/"')
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(1)
})
await browser
.elementByCss('#to-static-page')
.click()
.waitForElementByCss('#static-page')
const linkToStaticPage = await browser
.elementByCss('#to-home')
// Go back to home page
.click()
// Wait for homepage to load
.waitForElementByCss('#to-static-page')
// Wait for the stale time to pass.
await waitFor(10000)
// Click on the link to the static page again
await linkToStaticPage.click()
// Wait for the static page to load again
await browser.waitForElementByCss('#static-page')
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(2)
})
})
it('should not re-fetch cached data when navigating back to a route group', async () => {
const browser = await next.browser('/prefetch-auto-route-groups')
// once the page has loaded, we expect a data fetch
expect(await browser.elementById('count').text()).toBe('1')
// once navigating to a sub-page, we expect another data fetch
await browser
.elementByCss("[href='/prefetch-auto-route-groups/sub/foo']")
.click()
// navigating back to the route group page shouldn't trigger any data fetch
await browser.elementByCss("[href='/prefetch-auto-route-groups']").click()
// confirm that the dashboard page is still rendering the stale fetch count, as it should be cached
expect(await browser.elementById('count').text()).toBe('1')
// navigating to a new sub-page, we expect another data fetch
await browser
.elementByCss("[href='/prefetch-auto-route-groups/sub/bar']")
.click()
// finally, going back to the route group page shouldn't trigger any data fetch
await browser.elementByCss("[href='/prefetch-auto-route-groups']").click()
// confirm that the dashboard page is still rendering the stale fetch count, as it should be cached
expect(await browser.elementById('count').text()).toBe('1')
await browser.refresh()
// reloading the page, we should now get an accurate total number of fetches
// the initial fetch, 2 sub-page fetches, and a final fetch when reloading the page
expect(await browser.elementById('count').text()).toBe('4')
})
it('should fetch again when the initially visited static page is visited after the stale time has passed', async () => {
const browser = await next.browser('/404')
let requests: string[] = []
browser.on('request', (req) => {
const path = new URL(req.url()).pathname
const headers = req.headers()
if (headers['rsc']) {
requests.push(path)
}
})
await browser.eval('location.href = "/static-page-no-prefetch"')
await browser
.elementByCss('#to-home')
.click()
.waitForElementByCss('#to-static-page')
// Wait for the stale time to pass.
await waitFor(10000)
await browser.elementByCss('#to-static-page-no-prefetch').click()
// Wait for the static page to load again
await browser.waitForElementByCss('#static-page-no-prefetch')
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page-no-prefetch')
).toHaveLength(1)
})
})
it('should renew the stale time after refetching expired RSC data', async () => {
const browser = await next.browser('/404')
let requests: string[] = []
browser.on('request', (req) => {
requests.push(new URL(req.url()).pathname)
})
// Navigate to home and wait for static page to be prefetched
await browser.eval('location.href = "/"')
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(1)
})
// Navigate to static page (should use cached data)
await browser
.elementByCss('#to-static-page')
.click()
.waitForElementByCss('#static-page')
// Go back to home
await browser
.elementByCss('#to-home')
.click()
.waitForElementByCss('#to-static-page')
// Wait for stale time to expire (10 seconds)
await waitFor(10000)
// Navigate to static page again (should refetch due to expired cache)
await browser
.elementByCss('#to-static-page')
.click()
.waitForElementByCss('#static-page')
// Verify that refetch happened
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(2)
})
// Go back to home
await browser
.elementByCss('#to-home')
.click()
.waitForElementByCss('#to-static-page')
// Wait less than the stale time (5 seconds - should still be fresh)
await waitFor(5000)
// Navigate to static page again (should NOT refetch - stale time should be renewed)
await browser
.elementByCss('#to-static-page')
.click()
.waitForElementByCss('#static-page')
// This should still be 2 - no new request should have been made
// If this fails, it means the stale time was not renewed after the refetch
await retry(async () => {
expect(
requests.filter((request) => request === '/static-page')
).toHaveLength(2)
})
})
})