def METHOD_NAME(self):
    scene0 = Scene()
    old_stack = list(director.scene_stack)
    director.run(scene0)
    # check first run 
    assert director.scene is scene0
    assert director.next_scene is None
    assert director.scene_stack == old_stack 
    # a second run must be rejected, we don't want to call twice
    # event_loop.run