Avoid FrozenError error in TestDiscoverer.
Avoid FrozenError error in TestDiscoverer.

SketchUp/testup-2,thomthom/testup-2,thomthom/testup-2,SketchUp/testup-2,SketchUp/testup-2,thomthom/testup-2,thomthom/testup-2,thomthom/testup-2,SketchUp/testup-2,thomthom/testup-2,SketchUp/testup-2,SketchUp/testup-2