Fix account URI in UpdatePollSerializer (mastodon#11194)

* Fix account URI in UpdatePollSerializer

Fixes mastodon#11185

* Add specs

app/serializers/activitypub/update_poll_serializer.rb

@@ -14,7 +14,7 @@ def type
   end
 
   def actor
-    ActivityPub::TagManager.instance.uri_for(object)
+    ActivityPub::TagManager.instance.uri_for(object.account)
   end
 
   def to

spec/serializers/activitypub/update_poll_spec.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe ActivityPub::UpdatePollSerializer do
+  let(:account) { Fabricate(:account) }
+  let(:poll)    { Fabricate(:poll, account: account) }
+  let!(:status) { Fabricate(:status, account: account, poll: poll) }
+
+  before(:each) do
+    @serialization = ActiveModelSerializers::SerializableResource.new(status, serializer: ActivityPub::UpdatePollSerializer, adapter: ActivityPub::Adapter)
+  end
+
+  subject { JSON.parse(@serialization.to_json) }
+
+  it 'has a Update type' do
+    expect(subject['type']).to eql('Update')
+  end
+
+  it 'has an object with Question type' do
+    expect(subject['object']['type']).to eql('Question')
+  end
+
+  it 'has the correct actor URI set' do
+    expect(subject['actor']).to eql(ActivityPub::TagManager.instance.uri_for(account))
+  end
+end

spec/workers/activitypub/distribute_poll_update_worker_spec.rb

@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+describe ActivityPub::DistributePollUpdateWorker do
+  subject { described_class.new }
+
+  let(:account)  { Fabricate(:account) }
+  let(:follower) { Fabricate(:account, protocol: :activitypub, inbox_url: 'http://example.com') }
+  let(:poll)     { Fabricate(:poll, account: account) }
+  let!(:status)  { Fabricate(:status, account: account, poll: poll) }
+
+  describe '#perform' do
+    before do
+      allow(ActivityPub::DeliveryWorker).to receive(:push_bulk)
+      follower.follow!(account)
+    end
+
+    it 'delivers to followers' do
+      subject.perform(status.id)
+      expect(ActivityPub::DeliveryWorker).to have_received(:push_bulk).with(['http://example.com'])
+    end
+  end
+end