def test_dead_cell_with_2_neighbours_keep_dead():
cell = Cell(Cell.DEAD)
live_neighbours = 2
cell.evolve(live_neighbours)
assert cell.status == Cell.DEAD
def test_dead_cell_with_3_neighbours_change_to_live():
cell = Cell(Cell.DEAD)
live_neighbours = 3
cell.evolve(live_neighbours)
assert cell.status == Cell.ALIVE
def test_alive_cell_with_fewer_fewer_2_neighbours_dies():
cell = Cell(Cell.ALIVE)
live_neighbours = 1
cell.evolve(live_neighbours)
assert cell.status == Cell.DEAD
def test_alive_cell_with_3_neighbours_keep_alive():
cell = Cell(Cell.ALIVE)
live_neighbours = 3
cell.evolve(live_neighbours)
assert cell.status == Cell.ALIVE
def test_alive_cell_with_more_than_3_neighbours_dies():
cell = Cell(Cell.ALIVE)
live_neighbours = 4
cell.evolve(live_neighbours)
assert cell.status == Cell.DEAD