diff --git a/devops-service/db/mongo/models/project.rb b/devops-service/db/mongo/models/project.rb
index 36abbc2..c4edc04 100644
--- a/devops-service/db/mongo/models/project.rb
+++ b/devops-service/db/mongo/models/project.rb
@@ -208,6 +208,7 @@ module Devops
         Project.new p
       end
 
+      # maybe it worth to move components functionality to devops-nibr?
       #TODO: create validator
       def validate_components
         raise InvalidRecord.new "Components is not a hash" unless self.components.is_a?(Hash)
diff --git a/devops-service/spec/models/project_spec.rb b/devops-service/spec/models/project_spec.rb
index 9d259c1..f150081 100644
--- a/devops-service/spec/models/project_spec.rb
+++ b/devops-service/spec/models/project_spec.rb
@@ -344,6 +344,7 @@ RSpec.describe Devops::Model::Project, type: :model do
     end
   end
 
+  # maybe it worth to move components functionality to devops-nibr?
   # describe '#validate_components' do
   #   it "raises InvalidRecord if one of component doesn't include filename" do
   #     project.components = {'name' => {}}
@@ -351,4 +352,12 @@ RSpec.describe Devops::Model::Project, type: :model do
   #   end
   # end
 
+  describe '.create_roles_response' do
+    it 'returns string' do
+      expect(described_class.create_roles_response('string')).to be_a(String)
+      hash = {new: %w(a), exist: %w(b), error: %w(c)}
+      expect(described_class.create_roles_response(hash)).to be_a(String)
+    end
+  end
+
 end
\ No newline at end of file