public void DeleteAsync_Attendance_DeletesCorrectly()
        {
            using var context = new UniversityContext(builder.Options);
            var repository = new AttendanceRepository(context);

            var attendance = new Attendance()
            {
                StudentId = 1, LessonInScheduleId = 1, IsPresent = true
            };
            var res = repository.AddAsync(attendance).Result;

            repository.DeleteAsync(res.Id).Wait();
            var deletedAttendance = repository.GetByIdAsync(res.Id).Result;

            Assert.That(deletedAttendance, Is.EqualTo(null));
        }