| StubCollator | Provides a stub Collator for the 'en' locale. |
| StubIntl | Provides fake static versions of the global functions in the intl extension |
| StubIntlDateFormatter | Provides a stub IntlDateFormatter for the 'en' locale. |
| StubLocale | Provides a stub Locale for the 'en' locale. |
| StubNumberFormatter | Provides a stub NumberFormatter for the 'en' locale. |