public void testUpdate()
{
// Arrange
int count = repo.All().Count();
repo.Add(entity);
this.repo.SaveChanges();
Assert.IsEmpty(repo.Get(x => x.FirstName == fn + "alala" &&
x.LastName == ln));
Assert.AreEqual(count + 1, repo.All().Count());
entity.FirstName += "alala";
// Act
repo.Update(entity);
repo.SaveChanges();
// Assert
Assert.NotNull(repo.Get(x => x.FirstName == fn + "alala" &&
x.LastName == ln));
this.repo.HardDelete(entity);
this.repo.SaveChanges();
}