public void SectionRepository_CanRetrieve()
{
var repo = new SectionRepository();
var section = new Section("секция 1");
var subsection1 = new Subsection("первый подраздел");
var subsection2 = new Subsection("второй подраздел");
section.Add(subsection1, subsection2);
repo.Store(section);
var actual = repo.Retrieve(section.Id);
Assert.AreEqual(section, actual);
}