Use add_master instead

spec/services/files/delete_service_spec.rb

@@ -37,7 +37,7 @@ describe Files::DeleteService do
   end
 
   before do
-    project.team << [user, :master]
+    project.add_master(user)
   end
 
   describe "#execute" do

spec/services/files/multi_service_spec.rb

@@ -36,7 +36,7 @@ describe Files::MultiService do
   end
 
   before do
-    project.team << [user, :master]
+    project.add_master(user)
   end
 
   describe '#execute' do