feat: add FollowAccepted domain event

crates/domain/src/events.rs

@@ -56,6 +56,11 @@ pub enum DomainEvent {
         user_id: UserId,
         movie_id: MovieId,
     },
+    FollowAccepted {
+        local_user_id: UserId,
+        remote_actor_url: String,
+        outbox_url: String,
+    },
 }
 
 #[async_trait]
@@ -82,3 +87,23 @@ impl EventEnvelope {
         self.ack.nack().await
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::value_objects::UserId;
+
+    #[test]
+    fn follow_accepted_matches() {
+        let uid = UserId::from_uuid(uuid::Uuid::new_v4());
+        let event = DomainEvent::FollowAccepted {
+            local_user_id: uid.clone(),
+            remote_actor_url: "https://remote.example/users/alice".to_string(),
+            outbox_url: "https://remote.example/users/alice/outbox".to_string(),
+        };
+        let DomainEvent::FollowAccepted { outbox_url, .. } = event else {
+            panic!("wrong variant");
+        };
+        assert_eq!(outbox_url, "https://remote.example/users/alice/outbox");
+    }
+}