assembly - `testl` eax against eax? -

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i trying understand assembly.

the assembly follows, interested in testl line:

000319df  8b4508        movl   0x08(%ebp), %eax   000319e2  8b4004        movl   0x04(%eax), %eax   000319e5  85c0          testl  %eax, %eax   000319e7  7407          je     0x000319f0

i trying understand point of testl between %eax , %eax? think specifics of code isn't important, trying understand test - wouldn't value true?

it tests whether eax 0, or above, or below. in case, jump taken if eax 0.


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