handlerUtils.test.ts

import { normalizeRoute, unlocalizeRoute, localizeRoute, localizeDataRoute } from './handlerUtils'

describe('normalizeRoute', () => {
  it('removes a trailing slash from a route', () => {
    expect(normalizeRoute('/foo/')).toEqual('/foo')
  })
  it('ignores a string without a trailing slash', () => {
    expect(normalizeRoute('/foo')).toEqual('/foo')
  })
  it('does not remove a lone slash', () => {
    expect(normalizeRoute('/')).toEqual('/')
  })
})

describe('unlocalizeRoute', () => {
  it('removes the locale prefix from an i18n route', () => {
    expect(
      unlocalizeRoute('/fr/foo', {
        defaultLocale: 'en',
        locales: ['en', 'fr', 'de'],
      }),
    ).toEqual('/foo')
  })
  it('removes the locale prefix from a root i18n route', () => {
    expect(
      unlocalizeRoute('/de', {
        defaultLocale: 'en',
        locales: ['en', 'fr', 'de'],
      }),
    ).toEqual('/')
  })
  it('does not modify a default locale route', () => {
    expect(
      unlocalizeRoute('/foo', {
        defaultLocale: 'en',
        locales: ['en', 'fr', 'de'],
      }),
    ).toEqual('/foo')
  })
})

describe('localizeRoute', () => {
  it('adds the locale prefix to an i18n route', () => {
    expect(
      localizeRoute('/foo', {
        defaultLocale: 'en',
        locales: ['en', 'fr', 'de'],
      }),
    ).toEqual('/en/foo')
  })
  it('adds the locale prefix to a root i18n route', () => {
    expect(
      localizeRoute('/', {
        defaultLocale: 'en',
        locales: ['en', 'fr', 'de'],
      }),
    ).toEqual('/en')
  })
  it('does not modify a prefixed i18n route', () => {
    expect(
      localizeRoute('/en/foo', {
        defaultLocale: 'en',
        locales: ['en', 'fr', 'de'],
      }),
    ).toEqual('/en/foo')
  })
})

describe('localizeDataRoute', () => {
  it('adds the locale prefix to a data route', () => {
    expect(localizeDataRoute('/_next/data/build/foo.json', '/en/foo')).toEqual('/_next/data/build/en/foo.json')
  })
  it('removes the index suffix from a root route', () => {
    expect(localizeDataRoute('/_next/data/build/index.json', '/en')).toEqual('/_next/data/build/en.json')
  })
  it('does not add the locale prefix if it already exists in the data route', () => {
    expect(localizeDataRoute('/_next/data/build/en/foo.json', '/en/foo')).toEqual('/_next/data/build/en/foo.json')
  })
  it('does not modify an RSC data route', () => {
    expect(localizeDataRoute('/foo.rsc', '/foo')).toEqual('/foo.rsc')
  })
})