public void OneUserStatisticTestZeroValues()
{
DateTime startDate = new DateTime(1991, 10, 11);
DateTime endDate = new DateTime(1995, 11, 11);
int idUser = 1;
ReportsService reports = new ReportsService();
var userStatistic = reports.GetUserPaymentStatistic(startDate, endDate, 1);
decimal paymentSum = userStatistic
.Payments
.Sum(t => t.PaySize);
Assert.AreEqual(0, paymentSum);
}