def test_large_board(self):
     player = Board(10, 10)
     cpu = Board(10, 10)
     self.assertIsInstance(player, Board)
     self.assertIsInstance(cpu, Board)
     self.assertEqual(
         player.render(),
         "  1 2 3 4 5 6 7 8 9 10 \nA . . . . . . . . . . \nB . . . . . . . . . . \nC . . . . . . . . . . \nD . . . . . . . . . . \nE . . . . . . . . . . \nF . . . . . . . . . . \nG . . . . . . . . . . \nH . . . . . . . . . . \nI . . . . . . . . . . \nJ . . . . . . . . . . "
     )
 def test_render_boad(self):
     board = Board(4, 4)
     cruiser = Ship("Cruiser", 3)
     board.place(cruiser, ["A1", "A2", "A3"])
     self.assertEqual(
         board.render(),
         "  1 2 3 4 \nA . . . . \nB . . . . \nC . . . . \nD . . . . ")
     self.assertEqual(
         board.render(True),
         "  1 2 3 4 \nA S S S . \nB . . . . \nC . . . . \nD . . . . ")
     board.cells['A1'].fire_upon()
     self.assertEqual(
         board.render(True),
         "  1 2 3 4 \nA H S S . \nB . . . . \nC . . . . \nD . . . . ")
     board.cells['A2'].fire_upon()
     board.cells['A3'].fire_upon()
     self.assertEqual(
         board.render(True),
         "  1 2 3 4 \nA X X X . \nB . . . . \nC . . . . \nD . . . . ")
            print("Please enter a number greater than 4")
        else:
            break
    player = Board(int(width), int(height))
    cpu = Board(int(width), int(height))

    os.system('clear')

    pc_submarine = Ship("Submarine", 2)
    pc_cruiser = Ship("Cruiser", 3)
    npc_submarine = Ship("Submarine", 2)
    npc_cruiser = Ship("Cruiser", 3)

    while True:
        os.system('clear')
        print(player.render(True))
        sub_coords = input("Pick two empty coordinates for your submarine, space separated ('A1 A2') \n")
        if player.isValidPlacement(pc_submarine, sub_coords.split(' ')) == False:
            os.system('clear')
            print(player.render(True))
            print("Please pick empty coordinates that are consecutive and not diagonal")
        else:
            player.place(pc_submarine, sub_coords.split(' '))
            break

    while True:
        os.system('clear')
        print(player.render(True))
        cruiser_coords = input("Pick three empty coordinates, space separated ('A1 A2 A3') \n")
        if player.isValidPlacement(pc_cruiser, cruiser_coords.split(' ')) == False:
            os.system('clear')