Add fetch_instance_info_worker_spec

app/workers/activitypub/fetch_instance_info_worker.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class FetchInstanceInfoWorker
+class ActivityPub::FetchInstanceInfoWorker
   include Sidekiq::Worker
   include JsonLdHelper
   include Redisable
@@ -64,9 +64,9 @@ class FetchInstanceInfoWorker
 
         body_to_json(response.body_with_limit)
       elsif response.code == 410
-        raise FetchInstanceInfoWorker::GoneError, "#{domain} is gone from the server"
+        raise ActivityPub::FetchInstanceInfoWorker::GoneError, "#{@instance.domain} is gone from the server"
       else
-        raise FetchInstanceInfoWorker::RequestError, "Request for #{domain} returned HTTP #{response.code}"
+        raise ActivityPub::FetchInstanceInfoWorker::RequestError, "Request for #{@instance.domain} returned HTTP #{response.code}"
       end
     end
   end

app/workers/scheduler/update_instance_info_scheduler.rb

@@ -7,7 +7,7 @@ class Scheduler::UpdateInstanceInfoScheduler
 
   def perform
     Instance.select(:domain).reorder(nil).find_in_batches do |instances|
-      FetchInstanceInfoWorker.push_bulk(instances) do |instance|
+      ActivityPub::FetchInstanceInfoWorker.push_bulk(instances) do |instance|
         [instance.domain]
       end
     end