public void start() {
        // Last minute init. Neither properties not annotations provided an
        // injector source.
        if (injector == null) {
            injector = createDefaultScenarioModuleInjectorSource().getInjector();
        }
        scenarioScope = injector.getInstance(ScenarioScope.class);
        scenarioScope.enterScope();
    }
@Test
    void shouldStartWhenInjectorSourceIsNull() {
        factory = new GuiceFactory();
        factory.start();
    }