def test_all_cells_dead():
""" All the cells are dead, no change """
seed = Board(0, (3, 3),
[['.', '.', '.'], ['.', '.', '.'], ['.', '.', '.']])
expected_generation_one = Board(
1, (3, 3), [['.', '.', '.'], ['.', '.', '.'], ['.', '.', '.']])
generation_one = seed.tick()
assert generation_one == expected_generation_one
def test_three_live_neighbours_live_four_live_neighbours_die():
""" Only cells with two or three live neighbours survive a generation"""
seed = Board(0, (3, 3),
[['.', '*', '.'], ['*', '*', '*'], ['.', '*', '.']])
expected_generation_one = Board(
1, (3, 3), [['*', '*', '*'], ['*', '.', '*'], ['*', '*', '*']])
generation_one = seed.tick()
assert generation_one == expected_generation_one
def test_cells_positioned_at_the_edge():
""" We consider neighbours outside the grid to be dead """
seed = Board(0, (3, 3),
[['*', '*', '*'], ['*', '.', '*'], ['*', '*', '*']])
expected_generation_one = Board(
1, (3, 3), [['*', '.', '*'], ['.', '.', '.'], ['*', '.', '*']])
generation_one = seed.tick()
assert generation_one == expected_generation_one
def test_an_adjacent_cell_with_sufficient_neighbours_lives():
""" Just one cell is live, and it has no neighbours, so must die"""
seed = Board(0, (3, 3),
[['.', '.', '*'], ['.', '*', '.'], ['*', '.', '.']])
expected_generation_one = Board(
1, (3, 3), [['.', '.', '.'], ['.', '*', '.'], ['.', '.', '.']])
generation_one = seed.tick()
assert generation_one == expected_generation_one
def test_single_cell_with_no_neighbours_dies():
""" Just one cell is live, and it has no neighbours, so must die"""
seed = Board(0, (3, 3),
[['.', '.', '.'], ['.', '*', '.'], ['.', '.', '.']])
expected_generation_one = Board(
1, (3, 3), [['.', '.', '.'], ['.', '.', '.'], ['.', '.', '.']])
generation_one = seed.tick()
assert generation_one == expected_generation_one