코드체크 업데이트

backend/internal/service/user_group_service_test.go

@@ -55,6 +55,7 @@ func (m *MockUserRepository) Update(ctx context.Context, user *domain.User) erro
 	m.updatedUsers = append(m.updatedUsers, copied)
 	return nil
 }
+
 func (m *MockUserRepository) Delete(ctx context.Context, id string) error {
 	return m.Called(ctx, id).Error(0)
 }