def METHOD_NAME():
    content = GLTFContent()
    scene = content.add_scene()
    assert len(content.scenes) == 1
    node_0 = scene.add_child()
    assert len(content.nodes) == 1
    assert len(scene.children) == 1
    assert len(node_0.children) == 0
    node_0.add_child()
    assert len(content.nodes) == 2
    assert len(node_0.children) == 1
    assert len(scene.nodes) == 2
    assert len(scene.positions_and_edges[0]) == 3
    node_0.children = []
    content.remove_orphans()
    assert len(node_0.children) == 0
    assert len(content.nodes) == 1
    assert len(scene.nodes) == 1