MySQL ALTER TABLE table_name AUTO_INCREMENT=1 doesn't work

I'm using yii and it's test system. Yii's fixture manager resets tables and their AI keys so:

DELETE FROM table_name;
ALTER TABLE table_name AUTO_INCREMENT = 1;

It was working good on server before that moment, when i upgraded to mysql 5.6.

Now i can't set AI for the table less, than it was before, e.g.:

CREATE TABLE new_table (
  id INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY (id));
// AI = 1
ALTER TABLE new_table AUTO_INCREMENT = 7;
// AI = 7
ALTER TABLE new_table AUTO_INCREMENT = 1;
// AI is still 7

But it must work, because there is no any row in the table.

How is it possible and how it could be fixed?

P.S.: on my vagrant machine i have mysql 5.5 and resetting AI key is working properly.