Covenant is about cooperation between God and His children. When we show ourselves faithful, God honors us. He tells us what to do and we obey Him. He blesses us because honor is given after faithfulness is shown.
Testing always implies an aspect of doubt. God created us with faith. Not only does He know we have faith, He expects us to use it. To imply that He has to test us to see if we have faith, is to say that God is not who He says He is.