public void SystemsExecutesILateUpdateSystemSystem()
        {
            var system = new LateUpdateSystemSpy();

            _systems.Add(system);
            _systems.LateUpdate();

            Assert.AreEqual(1, system.DidExecute);
        }
        public void ExecutesLateUpdateSystemSpy()
        {
            var system = new LateUpdateSystemSpy();

            Assert.AreEqual(0, system.DidExecute);

            system.LateUpdate();

            Assert.AreEqual(1, system.DidExecute);
        }