How efficient CAVS is?

I installed CAVS and decided to check how well it protected my computer. I ran standard anti virus tests on To my huge disappointment it failed it all. It did not detect, intercepted or stopped any of them. It was able to to locate them later only after a hard drive scan. I understand that CAVS is free, but…it still suppose to protect against viruses.
I tried F-Prot and NOD32. F-Prot missed txt test. NOD32 intercepted them all.