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That is not correct. They test at a much lower current, then that.The manufacturer does not "choose" the current of a zener, it is measured as the maximum amount of current that the zener will allow to flow through itself without being damaged.
The voltage of a zener diode is constant, it won't change if the current changes. The manufacturer does not "choose" the current of a zener, it is measured as the maximum amount of current that the zener will allow to flow through itself without being damaged.