Illrigger spell - Vengeful Blade - would it break the targets concentration

The spell states:  On a hit, the target suffers the weapon attack’s normal effects and then radiates a dark aura of energy until the start of your next turn. If the target makes an attack or casts a spell before then, the target takes 1d8 necrotic damage and the spell ends.

Would the target need to roll for concentration if they cast a spell? (presuming they are casting a concentration spell).

Rolling for concentration would be moot because the ability says "the target takes 1d8 necrotic damage and the spell ends."

It's an interesting question. I'd go with the rules for simultaneous effects. Assuming the target is casting the spell on their turn, they can choose to take the damage first, thus not having to roll for concentration.