Apple Hardware Test automatically runs?

Hello everyone,
When I turned on my 13" macbook pro today, it ran the Apple Hardware Test. I ran the test and found no errors.
Is it normal for macs to automatically run this diagnostic tool? Because ive done a quick search on the internet and it seems as if the Hardware Test runs when you insert the software disk that comes with the macbook.
There is no CD in my optical drive, and I bought the macbook 6 months ago.
So is everything ok? because it worried me quite considerably that something is wrong my by macbook.
Thanks!

AFAIK, they don't even document this in the ACMT material. That's nice. It means I shouldn't need to stock all those application DVDs at work. Usually I just load the appropriate ASD revision onto my external HDD, but that may just come in handy some day.
I'm also betting AHT is installed on the firmware chip. Honestly, the downloadable version for service techs is only like 3-5MB on average. And EFI is what a modern BIOS/firmware should be... It initializes the hardware, then hands things over to the OS and gets out of the way. You have a cheap little 32Mb or 64Mb flash chip, you'd probably have room to spare.

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