public void testUpdate()
{
// Arrange
int count = repo.All().Count();
repo.Add(entity);
this.repo.SaveChanges();
Assert.Null(repo.GetByDetails(99, "ס"));
Assert.AreEqual(count + 1, repo.All().Count());
entity.ClassNumber = 99;
// Act
repo.Update(entity);
repo.SaveChanges();
// Assert
Assert.NotNull(repo.GetByDetails(99, "ס"));
this.repo.HardDelete(entity);
this.repo.SaveChanges();
}