If the engine was off it's definitely not the CV joints, the wheel bearings, or the endlinks...
It's bad inner or outer tie rod end, those are the only components being stressed during that test.
That being said, it may be a normal sound. Mine does the same thing when I jerk the wheel back and forth with the engine off in my driveway. I jacked up the front last year and checked for any play in the steering components but didn't find anything. As long as it doesn't do it while you're moving I think you'll be fine.