Why didn't Yusuf (as) reveal his identity to his brothers from the start?

Why didn't Yusuf (as) reveal his identity to his brothers, when they first came to him? > وَجَاءَ إِخْوَةُ يُوسُفَ فَدَخَلُوا عَلَيْهِ فَعَرَفَهُمْ وَهُمْ لَهُ > مُنكِرُونَ - 12:58 > >And the brothers of Joseph came [seeking food], and they entered upon him; and he recognized them, but he was to them unknown. From what I understand, he was going to forgive his brothers and wanted to essentially bring his brothers & parents to Egypt, and this perhaps could have been achieved by just revealing his identity at the first instance? As opposed to requesting that they bring Benjamin, then hiding a cup in his luggage etc.? Not questioning what happened or whether this was the best course of action. **Just interested to hear what scholars of tafsir/quran have said about this**.