Fix tests

app/models/repository.rb

 require 'securerandom'
 class Repository
-  REF_MERGE_REQUEST = 'merge-requests'
-  REF_KEEP_AROUND = 'keep-around'
-  REF_ENVIRONMENTS = 'environments'
+  REF_MERGE_REQUEST = 'merge-requests'.freeze
+  REF_KEEP_AROUND = 'keep-around'.freeze
+  REF_ENVIRONMENTS = 'environments'.freeze
   RESERVED_REFS_NAMES = %W[
     heads

spec/models/project_spec.rb

@@ -1563,14 +1563,14 @@ describe Project do
   describe 'project import state transitions' do
     context 'state transition: [:started] => [:finished]' do
-      let(:housecleaning_service) { spy(:housecleaning_service) }
+      let(:after_import_service) { spy(:after_import_service) }
       let(:housekeeping_service) { spy(:housekeeping_service) }
       before do
-        allow(Projects::HousecleaningService)
-          .to receive(:new) { housecleaning_service }
-        allow(housecleaning_service)
+        allow(Projects::AfterImportService)
+          .to receive(:new) { after_import_service }
+        allow(after_import_service)
           .to receive(:execute) { housekeeping_service.execute }
         allow(Projects::HousekeepingService)
@@ -1589,7 +1589,7 @@ describe Project do
         project.import_finish
-        expect(housecleaning_service).to have_received(:execute)
+        expect(after_import_service).to have_received(:execute)
         expect(housekeeping_service).to have_received(:execute)
       end