public DataManager(IAnswersRepository answersRepository, IQuestionsRepository questionsRepository, ITestsRepository testsRepository, IStatisticRepository statisticRepository, IUsersRepository usersRepository, IWrittenLettersRepository writtenLettersRepository)
 {
     this.answersRepository        = answersRepository;
     this.questionsRepository      = questionsRepository;
     this.testsRepository          = testsRepository;
     this.statisticRepository      = statisticRepository;
     this.writtenLettersRepository = writtenLettersRepository;
     this.usersRepository          = usersRepository;
 }
 public DataManagerMock(IAnswersRepository answersRepository, IQuestionsRepository questionsRepository,
                        ITestsRepository testsRepository, IStatisticRepository statisticRepository, IUsersRepository usersRepository, IWrittenLettersRepository writtenLettersRepository)
 {
     Answers        = answersRepository;
     Questions      = questionsRepository;
     Tests          = testsRepository;
     Statistic      = statisticRepository;
     Users          = usersRepository;
     WrittenLetters = writtenLettersRepository;
 }