public UserService(
     IRoleRepository roleRepository,
     IQuestionTypeRepository questionTypeRepository,
     ITestingAreaRepository testingAreaRepository
     )
 {
     this.roleRepository = roleRepository;
     this.questionTypeRepository = questionTypeRepository;
     this.testingAreaRepository = testingAreaRepository;
 }
 public TestingAreaService(ITestingAreaRepository testingAreaRepository)
 {
     this.testingAreaRepository = testingAreaRepository;
 }