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react-code-dataset / next.js /test /e2e /app-dir /back-forward-cache /back-forward-cache.test.ts
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import { nextTestSetup } from 'e2e-utils'
import { retry } from 'next-test-utils'
describe('back/forward cache', () => {
const { next } = nextTestSetup({
files: __dirname,
})
it('React state is preserved when navigating with back/forward buttons', async () => {
const browser = await next.browser('/page/1')
// Accumulate some state on page 1.
await retry(async () => {
// we do this inside of retry in case button event handler
// isn't ready yet
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 1')
})
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 2')
// Navigate to page 2. Accumulate some state here, too.
const linkToPage2 = await browser.elementByCss('a[href="/page/2"]')
await linkToPage2.click()
const incrementButton2 = await browser.elementById('increment-button-2')
const counterDisplay2 = await browser.elementById('counter-display-2')
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
expect(await counterDisplay2.text()).toBe('Count: 9')
// Navigate back to page 1. Its state should be preserved.
await browser.back()
const counterDisplay1AfterNav =
await browser.elementById('counter-display-1')
expect(await counterDisplay1AfterNav.text()).toBe('Count: 2')
// Navigate forward to page 2. Its state should be preserved.
await browser.forward()
const counterDisplay2AfterNav =
await browser.elementById('counter-display-2')
expect(await counterDisplay2AfterNav.text()).toBe('Count: 9')
})
it('React state is preserved when navigating back/forward with links', async () => {
const browser = await next.browser('/page/1')
// Accumulate some state on page 1.
// Accumulate some state on page 1.
await retry(async () => {
// we do this inside of retry in case button event handler
// isn't ready yet
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 1')
})
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 2')
// Navigate to page 2. Accumulate some state here, too.
const linkToPage2 = await browser.elementByCss('a[href="/page/2"]')
await linkToPage2.click()
const incrementButton2 = await browser.elementById('increment-button-2')
const counterDisplay2 = await browser.elementById('counter-display-2')
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
expect(await counterDisplay2.text()).toBe('Count: 9')
// Navigate back to page 1. Its state should be preserved.
const linkToPage1 = await browser.elementByCss('a[href="/page/1"]')
await linkToPage1.click()
const counterDisplay1AfterNav =
await browser.elementById('counter-display-1')
expect(await counterDisplay1AfterNav.text()).toBe('Count: 2')
// Navigate back to page 2. Its state should be preserved.
await linkToPage2.click()
const counterDisplay2AfterNav =
await browser.elementById('counter-display-2')
expect(await counterDisplay2AfterNav.text()).toBe('Count: 9')
})
it('React state is preserved when navigating back to a page with different search params than before ', async () => {
const browser = await next.browser('/page/1')
// Accumulate some state on page 1.
await retry(async () => {
// we do this inside of retry in case button event handler
// isn't ready yet
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 1')
})
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 2')
// Navigate to page 2.
const linkToPage2 = await browser.elementByCss('a[href="/page/2"]')
await linkToPage2.click()
// Navigate back to page 1, but with a different search param.
const linkToPage1WithSearchParam = await browser.elementByCss(
'a[href="/page/1?param=true"]'
)
await linkToPage1WithSearchParam.click()
await retry(async () => {
const counterDisplay1AfterNav =
await browser.elementById('counter-display-1')
const hasSearchParam = await browser.elementById('has-search-param-1')
expect(await counterDisplay1AfterNav.text()).toBe('Count: 2')
expect(await hasSearchParam.text()).toBe('Has search param: yes')
})
})
it('bfcache only preserves up to N entries', async () => {
// The current limit is hardcoded to 3.
const browser = await next.browser('/page/1')
await retry(async () => {
expect(await browser.elementByCss('h2').text()).toEqual('Page 1')
})
// Accumulate some state on page 1.
await retry(async () => {
// we do this inside of retry in case button event handler
// isn't ready yet
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 1')
})
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 2')
// Navigate to page 2. Accumulate some state here, too.
const linkToPage2 = await browser.elementByCss('a[href="/page/2"]')
await linkToPage2.click()
await retry(async () => {
expect(await browser.elementByCss('h2').text()).toEqual('Page 2')
})
const incrementButton2 = await browser.elementById('increment-button-2')
const counterDisplay2 = await browser.elementById('counter-display-2')
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
expect(await counterDisplay2.text()).toBe('Count: 9')
// Navigate to 2 additional pages.
const linkToPage3 = await browser.elementByCss('a[href="/page/3"]')
await linkToPage3.click()
await retry(async () => {
expect(await browser.elementByCss('h2').text()).toEqual('Page 3')
})
const linkToPage4 = await browser.elementByCss('a[href="/page/4"]')
await linkToPage4.click()
await retry(async () => {
expect(await browser.elementByCss('h2').text()).toEqual('Page 4')
})
// The bfcache size is now 4. Because the limit is 3, page 1 should have
// been evicted, but not page 2.
// Navigate to page 2 to confirm its state is preserved.
await linkToPage2.click()
await retry(async () => {
expect(await browser.elementByCss('h2').text()).toEqual('Page 2')
})
const counterDisplay2AfterNav =
await browser.elementById('counter-display-2')
expect(await counterDisplay2AfterNav.text()).toBe('Count: 9')
// Navigate back to page 1 to confirm its state is not preserved.
const linkToPage1 = await browser.elementByCss('a[href="/page/1"]')
await linkToPage1.click()
await retry(async () => {
expect(await browser.elementByCss('h2').text()).toEqual('Page 1')
})
const counterDisplay1AfterNav =
await browser.elementById('counter-display-1')
expect(await counterDisplay1AfterNav.text()).toBe('Count: 0')
})
it('navigate back and forth repeatedly between the same pages without evicting', async () => {
// The current limit is hardcoded to 3.
const browser = await next.browser('/page/1')
// Accumulate some state on page 1.
await retry(async () => {
// we do this inside of retry in case button event handler
// isn't ready yet
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 1')
})
await browser.elementById('increment-button-1').click()
const counterDisplay1 = await browser.elementById('counter-display-1')
expect(await counterDisplay1.text()).toBe('Count: 2')
// Navigate to page 2. Accumulate some state here, too.
const linkToPage2 = await browser.elementByCss('a[href="/page/2"]')
await linkToPage2.click()
const incrementButton2 = await browser.elementById('increment-button-2')
const counterDisplay2 = await browser.elementById('counter-display-2')
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
await incrementButton2.click()
expect(await counterDisplay2.text()).toBe('Count: 9')
// Navigate between pages 1 and 2 repeatedly
const linkToPage1 = await browser.elementByCss('a[href="/page/1"]')
await linkToPage1.click()
await linkToPage2.click()
await linkToPage1.click()
await linkToPage2.click()
await linkToPage1.click()
await linkToPage2.click()
// Confirm the state is preserved on both pages.
const counterDisplay2AfterNav =
await browser.elementById('counter-display-2')
expect(await counterDisplay2AfterNav.text()).toBe('Count: 9')
await linkToPage1.click()
const counterDisplay1AfterNav =
await browser.elementById('counter-display-1')
expect(await counterDisplay1AfterNav.text()).toBe('Count: 2')
})
})