SpringBoot Junit testing main method - spring-boot

Question

I have below test for my spring boot main method.
The test tries to start the application 2 times which is expected.
First time when it starts the application it uses the Mock object hewever 2nd time it starts the application it calls the actual bean.
I have ReferenceDataService having #PostConstract method call which makes rest call to some other application which I don't want in my tests.
Another thing is that MqConfiguration which tries to connect to IBM queues that also I would like to avoid in my test.
Please note even though I have added #ComponentScan(excludeFilters... in my test class it does not exclude it.
How do I write test for my main method in this case?
#ActiveProfiles(profiles = {"test"})
#RunWith(SpringRunner.class)
#SpringBootTest(classes = MainApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT, properties = {
"camel.springboot.java-routes-include-pattern=**/NONE*"})
#EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class, SecurityAutoConfiguration.class})
#DirtiesContext(classMode = ClassMode.AFTER_EACH_TEST_METHOD)
#ComponentScan(excludeFilters = {#ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = {MqConfiguration.class, ReferenceDataCache.class})})
public class MainApplicationTest {
#MockBean
private MqService mqService;
#MockBean
private ReferenceDataService referenceDataService;
#SpyBean
private ReferenceDataCache cacheSpy;
#Test
public void test() {
Mockito.when(referenceDataService.getCurrencies()).thenReturn(new HashMap<>());
Mockito.when(referenceDataService.getFrequencies()).thenReturn(null);
Mockito.when(referenceDataService.getDayCountTypes()).thenReturn(null);
Mockito.when(referenceDataService.getBusinessDayConverntions()).thenReturn(null);
Mockito.when(referenceDataService.getRateDefinations()).thenReturn(null);
Mockito.when(referenceDataService.getBusinessCalendar()).thenReturn(null);
Mockito.when(referenceDataService.getFinancingTypes()).thenReturn(null);
Mockito.when(referenceDataService.getStaffs()).thenReturn(null);
MainApplication.main(new String[]{});
}
}
MainApplication.java (The class to be tested)
#SpringBootApplication
#EnableJms
#EnableCaching
#AutoConfigureBefore(JmsAutoConfiguration.class)
public class MainApplication {
private static final Logger logger = LoggerFactory.getLogger(MainApplication.class);
public static void main(String[] args) {
SpringApplication.run(MainApplication.class, args);
}
}

Answer 1

One could split it into two separate testing parts as we should strive to test a single functionality per test (Single Responsibility Principle). You could model your testing like below:
#Test
public void applicationContextLoadedTest(){
}
#Test
public void applicationStartTest() {
//you can add your mocks as per your required dependencies and requirements
MainApplication.main(new String[] {});
}
Alternatively, if you are allowed to use PowerMockito, then the following link gives you a working example for verifying static invocations.PowerMockito - SpringBoot test