TEST_F(TestSceneManager, update) {
    MyApp manager;
    manager.add<Title>("Title");
    manager.add<Game>("Game");
    manager.update();
    manager.update();
    manager.update();
    manager.update();
    manager.update();
    EXPECT_EQ(manager.get()->t, 5);
    manager.update();
    EXPECT_EQ(manager.getState(), "Game");
}