As I understand from the docs the --root option lets you define the path the files are relative to.
I’ve tried setting it up like this:
testee test/test.html --root https://trunk.domain.com/labs/qunit --browsers chrome
I expexted it to open chrome with this url: https: // trunk.domain.com/labs/qunit/test/test.html
But it opened chrome with this url: http://localhost:3996/test/test.html?__token=j5gfk0