public void UsersStatisticTest()
        {
            StatisticService statistic = new StatisticService();
            var usersStatistic = statistic.GetUsersStatistic().ToList();

            int winnersFirstUser = usersStatistic.First(t => t.Id == 1).NumOfDogsWinners;
            Assert.AreEqual(2, winnersFirstUser);

            int winnersSecondUser = usersStatistic.First(t => t.Id == 2).NumOfDogsWinners;
            Assert.AreEqual(1, winnersSecondUser);
        }