@Override
protected void process(Entity e) {
int mod = (e.getId() % 2 == 0) ? 1 : 2;
Position pos = mapper.get(e);
pos.add(new Vec2f(10 * mod, 0));
pos.xy(pos.x, pos.y * -10 * mod);
pos = mapper.get(e);
assertEquals(3 + iteration * 10f * mod, pos.x, 0.1);
assertEquals(7 * Math.pow(-10f * mod, iteration), pos.y, 0.1);