use billy::World;

#[test]
fn create_and_get_resource_immutably() {

	let world = init_world();

	let fps = world.get_resource::<FpsResource>().unwrap();

	assert_eq!(fps.0, 60)

}

#[test]
fn get_resources_mutably() {

	let mut world = init_world();

	{

		let fps: &mut FpsResource = world.get_resource_mut::<FpsResource>().unwrap();
		fps.0 += 9;

	}

	let fps = world.get_resource::<FpsResource>().unwrap();

	assert_eq!(fps.0, 69);

}

#[test]
fn delete_resource() {

	let mut world = init_world();
	world.delete_resource::<FpsResource>();

	let deleted_resource = world.get_resource::<FpsResource>();

	assert!(deleted_resource.is_none());

}

fn init_world() -> World {

	let mut world = World::new();
	world.add_resource(FpsResource(60));

	world
}

#[derive(Debug)]
struct FpsResource(pub u32);

impl std::ops::Deref for FpsResource {

	type Target = u32;

	fn deref(&self) -> &Self::Target {

		&self.0

	}
}