We can view the pillars of Islam as tests.
- The Shahadah is a test for the heart.
- The prayer is a test for the limbs and for a Muslim’s ability to organize himself and his time.
- Zakat is a test for man in his wealth.
- Fasting tests a person on how much they are able to leave their desires for the sake of his Creator and Lord.
- Hajj tests how much one is able to bear the hardship and difficulties of travelling in the way of Allah.