public void DeleteItemTest()
        {
            var repo = new StudentsRepository(_context);
            var item = new Student
            {
                FirstName     = "Kurt",
                MiddleName    = "Unknown",
                LastName      = "Wallander",
                Address       = "Ystad",
                Birthday      = new DateTime(1961, 05, 23),
                Email         = "*****@*****.**",
                LogbookNumber = 4366,
                Group         = _context.Groups.FirstOrDefault()
            };
            int Id = _context.Students.FirstOrDefault(x => x.LogbookNumber == item.LogbookNumber).Id;

            Assert.AreEqual(item.LogbookNumber, repo.GetItem(Id).LogbookNumber);
            repo.DeleteItem(Id);
            var deleted = repo.GetItem(Id).LogbookNumber;
        }