Add tests for Geo::RepositoryBackfillService

app/services/geo/repository_backfill_service.rb

@@ -15,11 +15,7 @@ module Geo
         log('Started repository sync')
 
         fetch_repositories do |started_at, finished_at|
-          log('Tracking sync information')
-          registry = Geo::ProjectRegistry.find_or_create_by(project_id: project.id)
-          registry.last_repository_synced_at = started_at
-          registry.last_repository_successful_sync_at = finished_at if finished_at
-          registry.save
+          update_tracking_database(started_at, finished_at)
         end
 
         log('Finished repository sync')
@@ -41,18 +37,9 @@ module Geo
       finished_at = nil
 
       begin
-        project.create_repository unless project.repository_exists?
-        log('Fetching repository')
-        project.repository.fetch_geo_mirror(ssh_url_to_repo)
-
-        # Second .wiki call returns a Gollum::Wiki, and it will always create the physical repository when not found
-        if project.wiki.wiki.exist?
-          log('Fetching wiki repository')
-          project.wiki.repository.fetch_geo_mirror(ssh_url_to_wiki)
-        end
-
-        log('Expiring caches')
-        project.repository.after_sync
+        fetch_project_repository
+        fetch_wiki_repository
+        expire_repository_caches
 
         finished_at = DateTime.now
       rescue Gitlab::Shell::Error => e
@@ -62,6 +49,25 @@ module Geo
       yield started_at, finished_at
     end
 
+    def fetch_project_repository
+      log('Fetching project repository')
+      project.create_repository unless project.repository_exists?
+      project.repository.fetch_geo_mirror(ssh_url_to_repo)
+    end
+
+    def fetch_wiki_repository
+      # Second .wiki call returns a Gollum::Wiki, and it will always create the physical repository when not found
+      if project.wiki.wiki.exist?
+        log('Fetching wiki repository')
+        project.wiki.repository.fetch_geo_mirror(ssh_url_to_wiki)
+      end
+    end
+
+    def expire_repository_caches
+      log('Expiring caches')
+      project.repository.after_sync
+    end
+
     def try_obtain_lease
       log('Trying to obtain lease to sync repository')
 
@@ -78,6 +84,14 @@ module Geo
       Gitlab::ExclusiveLease.cancel(lease_key, repository_lease)
     end
 
+    def update_tracking_database(started_at, finished_at)
+      log('Tracking sync information')
+      registry = Geo::ProjectRegistry.find_or_create_by(project_id: project.id)
+      registry.last_repository_synced_at = started_at
+      registry.last_repository_successful_sync_at = finished_at if finished_at
+      registry.save
+    end
+
     def lease_key
       @key ||= "#{LEASE_KEY_PREFIX}:#{project.id}"
     end

spec/services/geo/repository_backfill_service_spec.rb

 require 'spec_helper'
 
 describe Geo::RepositoryBackfillService, services: true do
-  let(:project) { create(:project) }
+  let!(:primary) { create(:geo_node, :primary, host: 'primary-geo-node') }
+  let(:project) { create(:empty_project) }
 
-  subject { Geo::RepositoryBackfillService.new(project) }
+  subject { described_class.new(project.id, '123456') }
 
   describe '#execute' do
-    pending { raise 'must be implemented' }
+    it 'fetches project repositories' do
+      fetch_count = 0
+
+      allow_any_instance_of(Repository).to receive(:fetch_geo_mirror) do
+        fetch_count += 1
+      end
+
+      subject.execute
+
+      expect(fetch_count).to eq 2
+    end
+
+    it 'expires repository caches' do
+      allow_any_instance_of(Repository).to receive(:fetch_geo_mirror) { true }
+
+      expect_any_instance_of(Repository).to receive(:after_sync).once
+
+      subject.execute
+    end
+
+    it 'releases leases' do
+      expect(Gitlab::ExclusiveLease).to receive(:cancel).exactly(2).and_call_original
+
+      subject.execute
+    end
+
+    context 'tracking database' do
+      it 'tracks repository sync' do
+        expect { subject.execute }.to change(Geo::ProjectRegistry, :count).by(1)
+      end
+
+      it 'stores last_repository_successful_sync_at when succeed' do
+        allow_any_instance_of(Repository).to receive(:fetch_geo_mirror) { true }
+
+        subject.execute
+
+        registry = Geo::ProjectRegistry.find_by(project_id: project.id)
+
+        expect(registry.last_repository_successful_sync_at).not_to be_nil
+      end
+
+      it 'reset last_repository_successful_sync_at when fail' do
+        allow_any_instance_of(Repository).to receive(:fetch_geo_mirror) { raise Gitlab::Shell::Error }
+
+        subject.execute
+
+        registry = Geo::ProjectRegistry.find_by(project_id: project.id)
+
+        expect(registry.last_repository_successful_sync_at).to be_nil
+      end
+    end
   end
 end