Fix #5059 - Stop processing payload if it's from local account (#5100)

spec/services/activitypub/process_collection_service_spec.rb

@@ -1,7 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe ActivityPub::ProcessCollectionService do
-  let(:actor) { Fabricate(:account) }
+  let(:actor) { Fabricate(:account, domain: 'example.com', uri: 'http://example.com/account') }
 
   let(:payload) do
     {
@@ -24,7 +24,7 @@ RSpec.describe ActivityPub::ProcessCollectionService do
   describe '#call' do
     context 'when actor is the sender'
     context 'when actor differs from sender' do
-      let(:forwarder) { Fabricate(:account) }
+      let(:forwarder) { Fabricate(:account, domain: 'example.com', uri: 'http://example.com/other_account') }
 
       it 'processes payload with sender if no signature exists' do
         expect_any_instance_of(ActivityPub::LinkedDataSignature).not_to receive(:verify_account!)