tedster - 2:00 am on Jan 5, 2011 (gmt 0)
Yes, that's one motivation for this kind of testing. Even more, suppose Google is looking at a particular kind of thing that shows up a number of times in their spidering of the web - such as a certain filename in a particular context.
That combination would be a kind of footprint that may indicate other qualities about the site. This particular file name (parked.php) could also be characteristic of something Google wants to investigate further if it appears on the site.