Tests do not need to be PHP or Perl scripts.
The URL must just match the filename...

Test configuration (from conf.xml file):

HTTP Error Code	506
CatchAll Pass	1
CatchAll Log	1
CatchAll Parm Pass	0

test.html	OK
test.html	OK
test.html	OK
test.html?price=	Error (bad value)
test.html?price=10	OK
test.html?price=ab	Error (type checking)
test.html?price=10ab	Error (bad value)
test.html?price=-100	Error (minvalue)
test.html?price=999999	Error (maxvalue)
test.html?price=99&currency=Euros	OK
test.html?price=99&currency=Yen	Error (enum type)
test.html?price=99999999&currency=Yen	Error (2 parms)
test.html?dummy=any	OK
test-pass.html?dummy=any	OK