def test_should_return_correct_set_of_alive_neighbours_of_cell(self):
# GIVEN
seed = set([(-1, -1), (-1, 0)])
game_of_life = GameOfLife(seed)
cell = (0, 0)
expected_neighbours = set([(-1, -1), (-1, 0)])
# WHEN
alive_neighbours = game_of_life.get_alive_neighbours(cell)
# THEN
self.assertEqual(expected_neighbours, alive_neighbours)
