def METHOD_NAME():
    rs = np.random.RandomState(47988)
    keys = []
    my_dict = None
    for _ in range(5):
        k = str(rs.randint(0, high=1000000))
        if my_dict is None:
            v = str(rs.randint(0, high=1000000))
            keys.append(v)
            my_dict = {k: v}
        else:
            my_dict = {k: my_dict}
        keys.append(k)
    keys.reverse()
    assert nested_dict_get(my_dict, keys[:-1]) == keys[-1]
    my_def = "devron"
    assert nested_dict_get(my_dict, "system", default=my_def) == my_def