def METHOD_NAME():
    assert get_node_from_dn(None) is None
    assert get_node_from_dn("") is None
    assert get_node_from_dn("node-") is None
    assert get_node_from_dn("node-aa") is None
    assert get_node_from_dn("node-1") == "1"
    assert get_node_from_dn("node-100") == "100"
    assert get_node_from_dn("aanode-1") == "1"
    assert get_node_from_dn("aanode-1aaa") == "1"
    assert get_node_from_dn("node-1node-2") == "1"