x86 - Assembly je, jns, jle which register does it use?

Question

Case 1:

cmp dword ptr[ebp + 18],00
mov eax, [ebp + 14]
je Game.exe+417442

Case 2:

test eax,eax
jns Game.exe+47137

Does it ALWAYS look at register eax? If not, how do we know what register it looks at to determine the jump?

Answer 1

Waitting for answers