Worker specs coverage increase (#32541)

spec/workers/activitypub/followers_synchronization_worker_spec.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ActivityPub::FollowersSynchronizationWorker do
+  let(:worker) { described_class.new }
+  let(:service) { instance_double(ActivityPub::SynchronizeFollowersService, call: true) }
+
+  describe '#perform' do
+    before { stub_service }
+
+    let(:account) { Fabricate(:account, domain: 'host.example') }
+    let(:url) { 'https://sync.url' }
+
+    it 'sends the status to the service' do
+      worker.perform(account.id, url)
+
+      expect(service).to have_received(:call).with(account, url)
+    end
+
+    it 'returns nil for non-existent record' do
+      result = worker.perform(123_123_123, url)
+
+      expect(result).to be(true)
+    end
+  end
+
+  def stub_service
+    allow(ActivityPub::SynchronizeFollowersService)
+      .to receive(:new)
+      .and_return(service)
+  end
+end