Create nested group factory

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/factories/groups.rb

@@ -19,5 +19,9 @@ FactoryGirl.define do
     trait :access_requestable do
       request_access_enabled true
     end
+
+    trait :nested do
+      parent factory: :group
+    end
   end
 end

spec/models/group_spec.rb

@@ -271,4 +271,11 @@ describe Group, models: true do
       expect(group.web_url).to include("groups/#{group.name}")
     end
   end
+
+  describe 'nested group' do
+    subject { create(:group, :nested) }
+
+    it { is_expected.to be_valid }
+    it { expect(subject.parent).to be_kind_of(Group) }
+  end
 end