CollisionSystem &collisionSystem = ecs.getComponentSystems().registerSystem<CollisionSystem>()
        .expects<PositionComponent>()
        .expects<VelocityComponent>();

    // CollisionSystem inherits from System class

    // ComponentSystems class for actually registering a system
    template<typename T, typename... Args>
    T &registerSystem(Args&&... args)
    {
        // TODO: Check if any of the existing entities fit into the newly registered system
        auto system = std::make_unique<T>(std::forward<Args>(args)...);
        T &sys = *system;
        systems.push_back(std::move(system));
        updateSystems.push_back(&sys);
        logger.log("System Registered: " + sys.name);

        return sys;
    }

    // System base class
    template<typename T>
    System &expects()
    {
        systemMask = systemMask | T::mask;
        return *this;
    }