def test__check_diagonal_left():
b = Board()
player = 1
assert b._check_diagonal_left(player, 3, 2) is False
assert b._check_diagonal_left(player, 2, 3) is False
assert b._check_diagonal_left(player, 1, 4) is False
assert b._check_diagonal_left(player, 0, 5) is False
assert b.add_disc(player, 3)
assert b.add_disc(player, 3)
assert b.add_disc(player, 3)
assert b.add_disc(player, 2)
assert b.add_disc(player, 2)
assert b.add_disc(player, 1)
player = 2
assert b.add_disc(player, 3)
assert b.add_disc(player, 2)
assert b.add_disc(player, 1)
assert b.add_disc(player, 0)
assert b._check_diagonal_left(player, 3, 2)
assert b._check_diagonal_left(player, 2, 3)
assert b._check_diagonal_left(player, 1, 4)
assert b._check_diagonal_left(player, 0, 5)
