Game of Life with rule 24 in Python

gol.py

from copy import copy

class GameOfLife:
    RULES = {
            (1,1,1): 0,
            (1,1,0): 0,
            (1,0,1): 0,
            (1,0,0): 1,
            (0,1,1): 1,
            (0,1,0): 0,
            (0,0,1): 0,
            (0,0,0): 0
            }

    def __init__(self, state):
        self.state = state
        self.n = len(state) 

    def __str__(self):
        return str(self.state)

    def __eq__(self, other):
        return self.state == other.state

    def step(self):
        state = copy(self.state)
        for i in range(0, self.n - 2):
            sublist = self.state[i: i+3]
            state[i+1] = self.RULES[tuple(sublist)]
        return GameOfLife(state)

test_gol.py

from gol import GameOfLife

def test_single_cell():
    g = GameOfLife([0])
    assert g.step() == g

def test_state_len():
    g = GameOfLife([0])
    assert g.n == 1

def test_three_cells():
    g = GameOfLife([1, 1, 1])
    assert g.step() == GameOfLife([1, 0, 1])

def test_five_cells():
    g = GameOfLife([1,1,0,0])
    assert g.step() == GameOfLife([1, 0, 1, 0])