Fix specs for Geo node's backfill feature

spec/models/geo_node_spec.rb

@@ -91,30 +91,6 @@ describe GeoNode, type: :model do
         expect(node.system_hook.push_events).to be_truthy
         expect(node.system_hook.tag_push_events).to be_truthy
       end
-
-      context 'backfill mechanism for a secondary node' do
-        before do
-          Sidekiq::Worker.clear_all
-        end
-
-        it 'schedules the scheduler worker' do
-          Sidekiq::Testing.fake! do
-            expect{ create(:geo_node, primary: false) }.to change(GeoScheduleBackfillWorker.jobs, :size).by(1)
-          end
-        end
-
-        it 'schedules the correct worker for the number of projects' do
-          Sidekiq::Testing.fake! do
-            2.times do
-              create(:project)
-            end
-
-            create(:geo_node, primary: false)
-
-            expect{ GeoScheduleBackfillWorker.drain }.to change(GeoBackfillWorker.jobs, :size).by(2)
-          end
-        end
-      end
     end
   end
 
@@ -249,4 +225,28 @@ describe GeoNode, type: :model do
       expect(node).to be_missing_oauth_application
     end
   end
+
+  describe '#backfill_repositories' do
+    before do
+      Sidekiq::Worker.clear_all
+    end
+
+    it 'schedules the scheduler worker' do
+      Sidekiq::Testing.fake! do
+        expect { node.backfill_repositories }.to change(GeoScheduleBackfillWorker.jobs, :size).by(1)
+      end
+    end
+
+    it 'schedules the correct worker for the number of projects' do
+      Sidekiq::Testing.fake! do
+        2.times do
+          create(:project)
+        end
+
+        node.backfill_repositories
+
+        expect { GeoScheduleBackfillWorker.drain }.to change(GeoBackfillWorker.jobs, :size).by(2)
+      end
+    end
+  end
 end

spec/services/geo/repository_backfill_service_spec.rb

 require 'spec_helper'
 
 describe Geo::RepositoryBackfillService, services: true do
-  subject { Geo::RepositoryBackfillService.new(project, geo_node) }
+  SYSTEM_HOOKS_HEADER = { 'Content-Type' => 'application/json', 'X-Gitlab-Event' => 'System Hook' }
+
   let(:project) { create(:project) }
   let(:geo_node) { create(:geo_node) }
 
+  subject { Geo::RepositoryBackfillService.new(project, geo_node) }
+
   describe '#execute' do
     it 'calls upon the system hook of the Geo Node' do
       WebMock.stub_request(:post, geo_node.geo_events_url)
@@ -12,7 +15,7 @@ describe Geo::RepositoryBackfillService, services: true do
       subject.execute
 
       expect(WebMock).to have_requested(:post, geo_node.geo_events_url).with(
-        headers: { 'Content-Type' => 'application/json', 'X-Gitlab-Event' => 'System Hook' },
+        headers: SYSTEM_HOOKS_HEADER,
         body: {
           event_name: 'push',
           project_id: project.id,