first commit

test/integration/prerender-revalidate/pages/index.js

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+export async function getStaticProps() {
+  return {
+    props: {
+      world: 'world',
+      time: new Date().getTime(),
+      other: Math.random(),
+    },
+    revalidate: 1,
+  }
+}
+
+const Page = ({ world, time, other }) => {
+  return (
+    <div>
+      <p>hello {world}</p>
+      <span>time: {time}</span>
+      <span>other: {other}</span>
+    </div>
+  )
+}
+
+export default Page

test/integration/prerender-revalidate/pages/named.js

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+export async function getStaticProps() {
+  return {
+    props: {
+      world: 'world',
+      time: new Date().getTime(),
+      other: Math.random(),
+    },
+    revalidate: 1,
+  }
+}
+
+const Page = ({ world, time, other }) => {
+  return (
+    <div>
+      <p>hello {world}</p>
+      <span>time: {time}</span>
+      <span>other: {other}</span>
+    </div>
+  )
+}
+
+export default Page

test/integration/prerender-revalidate/pages/nested/index.js

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+export async function getStaticProps() {
+  return {
+    props: {
+      world: 'world',
+      time: new Date().getTime(),
+      other: Math.random(),
+    },
+    revalidate: 1,
+  }
+}
+
+const Page = ({ world, time, other }) => {
+  return (
+    <div>
+      <p>hello {world}</p>
+      <span>time: {time}</span>
+      <span>other: {other}</span>
+    </div>
+  )
+}
+
+export default Page

test/integration/prerender-revalidate/pages/nested/named.js

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+export async function getStaticProps() {
+  return {
+    props: {
+      world: 'world',
+      time: new Date().getTime(),
+      other: Math.random(),
+    },
+    revalidate: 1,
+  }
+}
+
+const Page = ({ world, time, other }) => {
+  return (
+    <div>
+      <p>hello {world}</p>
+      <span>time: {time}</span>
+      <span>other: {other}</span>
+    </div>
+  )
+}
+
+export default Page

test/integration/prerender-revalidate/pages/static.js

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+export async function getStaticProps() {
+  return {
+    props: {
+      world: 'world',
+    },
+    revalidate: 10,
+  }
+}
+
+const Page = ({ world }) => {
+  return (
+    <div>
+      <p>hello {world}</p>
+    </div>
+  )
+}
+
+export default Page

test/integration/prerender-revalidate/test/index.test.ts

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+/* eslint-env jest */
+
+import fs from 'fs-extra'
+import {
+  findPort,
+  killApp,
+  nextBuild,
+  nextStart,
+  renderViaHTTP,
+  waitFor,
+  getPageFileFromPagesManifest,
+  fetchViaHTTP,
+} from 'next-test-utils'
+import { join } from 'path'
+
+const appDir = join(__dirname, '..')
+let app
+let appPort
+let buildId
+
+function runTests(route, routePath) {
+  it(`[${route}] should regenerate page when revalidate time exceeded`, async () => {
+    const fileName = join(
+      appDir,
+      '.next',
+      'server',
+      getPageFileFromPagesManifest(appDir, routePath).replace('.js', '.html')
+    )
+    const initialHtmlFile = await fs.readFile(fileName, 'utf8')
+
+    await waitFor(1000) // Wait revalidate duration
+
+    expect(await renderViaHTTP(appPort, route)).toBe(initialHtmlFile)
+
+    await waitFor(500) // Wait for regeneration to occur
+
+    const regeneratedFileHtml = await fs.readFile(fileName, 'utf8')
+    expect(regeneratedFileHtml).not.toBe(initialHtmlFile)
+    expect(await renderViaHTTP(appPort, route)).toBe(regeneratedFileHtml)
+  })
+
+  it(`[${route}] should regenerate /_next/data when revalidate time exceeded`, async () => {
+    const fileName = join(
+      appDir,
+      '.next',
+      'server',
+      getPageFileFromPagesManifest(appDir, routePath).replace('.js', '.json')
+    )
+    const route = join(`/_next/data/${buildId}`, `${routePath}.json`)
+    const initialFileJson = await fs.readFile(fileName, 'utf8')
+
+    await waitFor(1000) // Wait revalidate duration
+
+    expect(JSON.parse(await renderViaHTTP(appPort, route))).toEqual(
+      JSON.parse(initialFileJson)
+    )
+
+    await waitFor(500) // Wait for regeneration to occur
+
+    const regeneratedFileJson = await fs.readFile(fileName, 'utf8')
+    expect(regeneratedFileJson).not.toBe(initialFileJson)
+    expect(JSON.parse(await renderViaHTTP(appPort, route))).toEqual(
+      JSON.parse(regeneratedFileJson)
+    )
+  })
+}
+
+describe('SSG Prerender Revalidate', () => {
+  ;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
+    'production mode',
+    () => {
+      beforeAll(async () => {
+        await fs.remove(join(appDir, '.next'))
+        await nextBuild(appDir, [])
+        appPort = await findPort()
+        app = await nextStart(appDir, appPort, {})
+        buildId = await fs.readFile(join(appDir, '.next/BUILD_ID'), 'utf8')
+      })
+      afterAll(() => killApp(app))
+
+      runTests('/', '/')
+      runTests('/named', '/named')
+      runTests('/nested', '/nested')
+      runTests('/nested/named', '/nested/named')
+
+      it('should return cache-control header on 304 status', async () => {
+        const url = `http://localhost:${appPort}`
+        const res1 = await fetchViaHTTP(url, '/static')
+        const cacheControl200 = res1.headers.get('Cache-Control')
+        const etag = res1.headers.get('ETag')
+
+        const headers = { 'If-None-Match': etag }
+        const res2 = await fetchViaHTTP(url, '/static', undefined, { headers })
+        const cacheControl304 = res2.headers.get('Cache-Control')
+        expect(cacheControl304).toEqual(cacheControl200)
+      })
+    }
+  )
+
+  // Regression test for https://github.com/vercel/next.js/issues/24806
+  describe('[regression] production mode and incremental cache size exceeded', () => {
+    ;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
+      'production mode',
+      () => {
+        beforeAll(async () => {
+          await fs.remove(join(appDir, '.next'))
+          await nextBuild(appDir, [])
+          appPort = await findPort()
+          app = await nextStart(appDir, appPort, {
+            // The lowest size of the LRU cache that can be set is "1"
+            // this will cause the cache size to always be exceeded
+            env: { __NEXT_TEST_MAX_ISR_CACHE: '1' },
+          })
+          buildId = await fs.readFile(join(appDir, '.next/BUILD_ID'), 'utf8')
+        })
+        afterAll(() => killApp(app))
+
+        runTests('/', '/')
+        runTests('/named', '/named')
+        runTests('/nested', '/nested')
+        runTests('/nested/named', '/nested/named')
+      }
+    )
+  })
+})