This is a list parameter which is treated as test result. It is
evaluted when the HTTP response for the test request is received.
It can be used to define custom tests without writing new plugins.
It can also be used to run some code when the HTTP response for the test
request is received.
( YESNO1, COMMENT1
YESNON, COMMENTN )
Here YESNO, COMMENT is a test result. YESNO is either
yes if test is successful or no if it is not. COMMENT is a
comment associated with this test.
See example in HTTP::WebTest::Cookbook.