Is a person's not knowing whether he is a believer or a hypocrite part of the divine test, and is it normal for no one to be certain of his faith?

Belief in the unseen is the foundation of testing servants. It encompasses everything reported by revelation that is hidden from the senses, and it includes the fundamentals of faith in God, His angels, His books, His messengers, the Last Day, and divine decree. It is the touchstone that distinguishes the sincere believer from the doubter. The believer affirms everything God and His Messenger have reported, whether they have witnessed it or not. As for a servant's lack of knowledge of their standing with God, this has no relation to belief in the unseen. Rather, it falls under the prohibition of speaking without knowledge and self-praise, and it calls the Muslim to be between hope and fear. The praiseworthy fear of hypocrisy is that which motivates one to strive in good deeds and combat ostentation, not that which discourages the Muslim from worship.