def test_3x_in_a_row(self):
for i, board in enumerate(("XXXO O O", "O XXXO O", "O OO XXX")):
with self.subTest(row=i + 1):
self.assertEqual(tic_tac_toe_winner(board), "X")
def test_illegal_symbols(self):
with self.assertRaises(ValueError):
tic_tac_toe_winner(" E ")
def test_too_large_board():
with pytest.raises(ValueError):
tic_tac_toe_winner("XOOOXXXXOX")
def test_3x_diagonally(): # pytest keep it out of class
assert tic_tac_toe_winner("XO OX X") == "X"
def test_empty_board(self):
self.assertIsNone(tic_tac_toe_winner(" " * 9))
def test_3x_in_a_column(self):
self.assertEqual(tic_tac_toe_winner("X XO XOO"), "X")
def test_3x_in_a_row():
winner = tic_tac_toe_winner("XXX O O ")
assert winner == "X", f"expected X, got {winner}"
def test_empty_board():
assert tic_tac_toe_winner(" " * 9) is None
def test_illegal_board_size():
try:
tic_tac_toe_winner("XXX")
assert False, "ValueError expected"
except ValueError:
pass
def test_illegal_board_symbols():
try:
tic_tac_toe_winner("Ala ma kota")
assert False, "ValueError expected"
except ValueError:
pass