Instead of fetching one domain, we use the same method as in site config (to retrieve the matching file) and handle api.example.org, example.org, .org (yes the last one isn’t useful).
If one of these match, we got it and use it.
It is not aimed to test if we can get the full article (since we aren't using real login/password)
but mostly to test the full work (with authentication, etc.)
Do not clean fixtured to avoid SQLite to re-use id for entry tag relation 😓
