Mobilizon.Service.HTTP.ActivityPub is wired up to a mock in config/test.exs:
config :tesla, Mobilizon.Service.HTTP.ActivityPub,
adapter: Mobilizon.Service.HTTP.ActivityPub.Mock
You’ll need a similar stanza to ones like this to handle the :post request that publish_one makes.
One thing I do wonder: how was this working before? I haven’t chased down what inbox typically is in publish_one calls, but were the specs making a real HTTP request?
