Same affix infused on an enchanted item

The question is simple. Has anyone tested having the same affix twice on an item?
Let’s say a weapon is enchanted and has ‘Gain 1% focus on damage dealt’. Now when I infuse a Topaz into this weapon, will both affixes work summed up, or just the higher one?
I guess it should be easy to test with ‘Healing Effects increased by 15-30%’ affix on a helmet and infusing Blood Stone or Ruby, but currently I do not have such an item to test with.