def test_valid(self, simple_tuple_node_list):
    nodes = [node(*tup) for tup in simple_tuple_node_list]
    assert (len(nodes) == len(simple_tuple_node_list))
def test_valid(self, simple_tuple_node_list):
    nodes = [node(*tup) for tup in simple_tuple_node_list]
    assert (len(nodes) == len(simple_tuple_node_list))