engine-ecs/tests/phase.rs


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use std::sync::atomic::{AtomicUsize, Ordering};

use engine_ecs::component::local::Local;
use engine_ecs::phase::UPDATE;
use engine_ecs::system::Into;
use engine_ecs::system::initializable::Initializable;
use engine_ecs::{Component, World};

#[derive(Component)]
struct Thing;

#[test]
fn system_run_order_correct_when_one_has_local_comp()
{
    static COUNTER: AtomicUsize = AtomicUsize::new(0);

    fn first_system(_thing: Local<Thing>)
    {
        assert_eq!(COUNTER.fetch_add(1, Ordering::Relaxed), 0);
    }

    fn second_system()
    {
        assert_eq!(COUNTER.fetch_add(1, Ordering::Relaxed), 1);
    }

    let mut world = World::new();

    world.register_system(*UPDATE, first_system.into_system().initialize((Thing,)));

    world.register_system(*UPDATE, second_system);

    world.step();

    assert_eq!(COUNTER.load(Ordering::Relaxed), 2);
}