Add basic coverage for `UnfavouriteService` class (#29329)

spec/services/unfavourite_service_spec.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe UnfavouriteService do
+  describe '#call' do
+    context 'with a favourited status' do
+      let(:status) { Fabricate(:status, account: account) }
+      let!(:favourite) { Fabricate(:favourite, status: status) }
+
+      context 'when the status account is local' do
+        let(:account) { Fabricate(:account, domain: nil) }
+
+        it 'destroys the favourite' do
+          subject.call(favourite.account, status)
+
+          expect { favourite.reload }
+            .to raise_error(ActiveRecord::RecordNotFound)
+        end
+      end
+
+      context 'when the status account is a remote activitypub account' do
+        let(:account) { Fabricate(:account, domain: 'host.example', protocol: :activitypub) }
+
+        it 'destroys the favourite and sends a notification' do
+          subject.call(favourite.account, status)
+
+          expect { favourite.reload }
+            .to raise_error(ActiveRecord::RecordNotFound)
+          expect(ActivityPub::DeliveryWorker)
+            .to have_enqueued_sidekiq_job(anything, favourite.account.id, status.account.inbox_url)
+        end
+      end
+    end
+  end
+end