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