Doh, forgot that buster will look in the file system for stuff you put in "sources".
For now, the only way is to manually load it in your tests. Kind of shitty, but it will at least work. You can get the actual path with buster.env.contextPath +"/googleapis/jquery/1.7.2/jquery.min.js", and then you need to manually create a script tag, and... Yeah.
Or you could add it to the test bed. Haven't tested this, but it should work.
{
resources: [
{path: "/", content: "<!DOCTYPE html><html><head><script src='googleapis/jquery/1.7.2/jquery.min.js'>{{scripts}}</head><body></body></html>"}
]
}
{{scripts}} is where the the config file scripts will be loaded. Make sure you use a relative path for the src attribute.