TEST and JS Question

Hi, been awhile since I've done asm . I know the test instruction just
does a and of the two regs, but it also sets flags like overflow and
sign. I can't for the life of me remember what sets the sign flag, so
if someone would help, here's the bit of code I need help figuring out
what its doing:

test al,al
js somewhere


Thanks!
Visit the Asteroid code project at: http://www.guddler.co.uk

.