protected ProducerService getProducerService() {
        return service;
    }
@Test
    void testStartDoesNotCreateNewProducerService() {
        // setup
        testObj.start();
        ProducerService expectedService = testObj.getProducerService();
        testObj.start();

        // act
        ProducerService result = testObj.getProducerService();

        // assert
        assertEquals(expectedService, result);
    }