public void SystemsInitializesIInitializeSystem()
        {
            var system = new InitializeSystemSpy();

            _systems.Add(system);
            _systems.Initialize();

            Assert.AreEqual(1, system.DidInitialize);
        }
        public void InitializesInitializeSystemSpy()
        {
            var system = new InitializeSystemSpy();

            Assert.AreEqual(0, system.DidInitialize);

            system.Initialize();

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