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));
}