def test_attack_miss():
board = Board()
result = board.attack(0, 1)
assert result == 'Miss. 0:1'
assert board[0][1] == 'M'
assert board.hit_ships == []
def test_attack_hit():
board = Board()
board[0][0] = 'C'
board[0][1] = 'C'
result = board.attack(0, 0)
assert result == 'Hit! 0:0'
assert board[0][0] == 'H'
assert board.hit_ships == ['C']
