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next.js/test/e2e/app-dir/ppr-root-param-fallback/ppr-root-param-fallback.test.ts
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first commit
2026-03-10 19:37:31 +03:30

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TypeScript

import { nextTestSetup } from 'e2e-utils'
describe('ppr-root-param-fallback', () => {
const { next } = nextTestSetup({
files: __dirname,
})
it('should have use-cache content in fallback shells for all pregenerated locales', async () => {
// Setup: The app has a [locale] param with generateStaticParams returning
// ['en', 'fr'], and a nested /[locale]/blog/[slug] route. The layout uses
// a 'use cache' function to fetch locale-specific translations.
//
// This test ensures that we generate fallback shells with the correct locale
// filled in for all pregenerated locales.
for (const locale of ['en', 'fr']) {
// next.render$ doesn't stream, so we get just the shell content
const $ = await next.render$(`/${locale}/blog/new-post`)
// The shell should have the locale-header with cached content,
// NOT the locale-loading Suspense fallback
expect($('#locale-header').length).toBe(1)
expect($('#locale-header').text()).toContain(`Locale: ${locale}`)
expect($('#translations').text()).toContain(`Home (${locale})`)
// The Suspense fallback should NOT be in the shell
expect($('#locale-loading').length).toBe(0)
}
})
})