fix c++ test fail
@@ -883,6 +883,8 @@ void System_new_from_iter() {
void System_each_w_mut_children_it() {
flecs::world world;
+ world.component<Velocity>();
+
auto parent = world.entity().set<Position>({0, 0});
auto e1 = world.entity().set<Position>({0, 0}).child_of(parent);
auto e2 = world.entity().set<Position>({0, 0}).child_of(parent);
