From my limited experience they like a technology, so have you been testing unix, sql, sap, siebel etc? A number of techs are on the skill list so just make sure you can talk about testing /and/ the underpinning tech.
Even if you don't get the speciality approved as has been said testing is the nec (not elsewhere classified) role.
The ACS accreditation isn't too difficult but would suggest you imagine it as a Technical Test Analyst rather than a functional one. The latter might still tick a box, but it seems to tick far fewer than it indicates they are after.
I was approved with a SAP specialism and therefore tier 2 priority, but things have slowed lately.
ACS applications Feb.
ACS approval May.
Application commenced 26th June 09
Case Officer 9th October
Medicals received 9th December
Police records done at the same time.
All quiet ever since and no idea why... Agent has requested a status update (5 day response apparently) but even that has so far gone without reply over a week later.
I went with the Emigration Group. Scrupulously professional, did assist with the ACS verification but in real technology terms you will be on your own obviously. Expensive, but then I don't yet have the visa so I'm probably feeling a little sensitive.
I went for a Skilled Independant - I like security if we're going to invest..
S.