The documentation at http://docs.jquery.com/Qunit#URL_Parameters

has an example link where the text says:

"swarm.jquery.org/git/jquery/test/?filter=effects"

but the href different and is:

"http://swarm.jquery.org/git/jquery/test/?effects"

The text version gives the correct result on the swarm site but the href version does not.

Frustatingly my local copy of QUnit works exactly oppositely. Sorry the qunit header does not carry a version number.