public ConsumerService getConsumerService() {
        return service;
    }
@Test
    void testStartDoesntCreateMultipleServices() {
        // setup
        testObj.start();
        ConsumerService expectedService = testObj.getConsumerService();
        testObj.start();

        // act
        ConsumerService result = testObj.getConsumerService();

        // assert
        assertEquals(expectedService, result);
    }