public void SorterTest()
{
SystemA systemA = new SystemA();
SystemB systemB = new SystemB();
SystemC systemC = new SystemC();
SystemD systemD = new SystemD();
SystemE systemE = new SystemE();
SystemF systemF = new SystemF();
SystemG systemG = new SystemG();
EcsSystemGroup root = new EcsSystemGroup();
root.AddSystem(systemE);
root.AddSystem(systemA);
root.AddSystem(systemD);
root.AddSystem(systemF);
root.AddSystem(systemC);
root.AddSystem(systemB);
root.AddSystem(systemG);
root.Update(0, new EcsWorld());
List <IEcsSystem> systems = new List <IEcsSystem>(root.Systems);
Assert.AreEqual(1, systems.Count);
systems = new List <IEcsSystem>(((EcsSystemGroup)systems[0]).Systems);
Assert.AreEqual(2, systems.Count);
Assert.AreEqual(systemG, systems[0]);
systems = new List <IEcsSystem>(((EcsSystemGroup)systems[1]).Systems);
Assert.AreEqual(systemF, systems[0]);
Assert.AreEqual(systemB, systems[1]);
Assert.AreEqual(systemD, systems[2]);
Assert.AreEqual(systemA, systems[3]);
Assert.AreEqual(systemE, systems[4]);
Assert.AreEqual(systemC, systems[5]);
EcsSystemSorter.Sort(new List <IEcsSystem> {
new SystemF(), new SystemG()
}); //ExpectedException
}
private void Update()
{
_engine.Update(Time.deltaTime, _world);
}