def test_empty_column_is_not_full(self):
board = Board()
board.print_grid()
self.assertTrue(board.column_not_full(3))
def test_full_column_is_full(self):
board = Board()
for y in xrange(6):
board.grid[y][3] = 'X'
board.print_grid()
self.assertFalse(board.column_not_full(3))