svelte-i18n/test/client/utils.test.ts

import {
  getClientLocale,
  capital,
  title,
  upper,
  lower,
} from '../../src/client/includes/utils'

describe('getting client locale', () => {
  beforeEach(() => {
    delete window.location
    window.location = {
      pathname: '/',
      hostname: 'example.com',
      hash: '',
      search: '',
    } as any
  })

  test('gets the locale based on the passed hash parameter', () => {
    window.location.hash = '#locale=en-US&lang=pt-BR'
    expect(getClientLocale({ hash: 'lang' })).toBe('pt-BR')
  })

  test('gets the locale based on the passed search parameter', () => {
    window.location.search = '?locale=en-US&lang=pt-BR'
    expect(getClientLocale({ search: 'lang' })).toBe('pt-BR')
  })

  test('gets the locale based on the navigator language', () => {
    expect(getClientLocale({ navigator: true })).toBe(window.navigator.language)
  })

  test('gets the locale based on the pathname', () => {
    window.location.pathname = '/en-US/foo/'
    expect(getClientLocale({ pathname: /^\/(.*?)\// })).toBe('en-US')
  })

  test('gets the locale base on the hostname', () => {
    window.location.hostname = 'pt.example.com'
    expect(getClientLocale({ hostname: /^(.*?)\./ })).toBe('pt')
  })

  test('returns null if no locale was found', () => {
    expect(getClientLocale({ search: 'lang' })).toBe(null)
  })
})

describe('string utilities', () => {
  test('transforms a string into capital case', () => {
    expect(capital('lowercase string')).toMatch('Lowercase string')
  })

  test('transforms a string into title case', () => {
    expect(title('lowercase string')).toMatch('Lowercase String')
  })

  test('transforms a string into uppercase', () => {
    expect(upper('lowercase string')).toMatch('LOWERCASE STRING')
  })

  test('transforms a string into lowercase', () => {
    expect(lower('UPPERCASE STRING')).toMatch('uppercase string')
  })
})