def test_find_negative_diagonal_c4(self):
board = Board()
board.grid[1][1] = 'X'
board.grid[2][2] = 'X'
board.grid[3][3] = 'X'
board.grid[4][4] = 'X'
board.print_grid()
self.assertTrue(board.look_for_4_negative_slopes('X'))
def test_do_not_find_negative_diagonal_c4(self):
board = Board()
self.assertFalse(board.look_for_4_negative_slopes('O'))
