The simpletests for project_usage are probably broken in D6, since they were never touched during porting to D6. It'd be nice to bring them up to the 6.x-2.* series of SimpleTest to pave the way for unified testing with core in D7.

They're also broken by #390856-1: Do a proper page/code split of project, but I figure it's best to just fix them all in one issue.