How efficient CAVS is?

I installed CAVS and decided to check how well it protected my computer. I ran standard anti virus tests on http://www.eicar.org/anti_virus_test_file.htm. 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.