Spring Boot testing with Junit - spring

Question

Using Spring Boot 2.0.3.RELEASE
The goal of the test is have a service call a controller in the same app.
Here is the simplified setup I am trying
The app class
#SpringBootApplication
public class StartApp {
public static void main(String[] args) {
SpringApplication.run(StartApp.class, args);
}
}
The controller class
#RestController
public class EmpCtrl {
private static final Logger logger = LoggerFactory.getLogger(EmpCtrl.class);
#Autowired
private EmpDao empDao;
#RequestMapping(value = "/emp01", produces = MediaType.APPLICATION_JSON_VALUE, method = RequestMethod.GET)
public List<Emp> findAllEmp01() {
logger.trace("running my.demo.controller.findAllEmp01");
List<Emp> emps = new ArrayList<>();
Iterable<Emp> results = this.empDao.findAll();
results.forEach(emp -> {emps.add(emp);});
return emps;
}
}
The service class
#Service
public class GetEmpSrv {
private static final Logger logger = LoggerFactory.getLogger(GetEmpSrv.class);
public void getEmps01(){
final String uri = "http://localhost:8080/emp01";
RestTemplate restTemplate = new RestTemplate();
String result = restTemplate.getForObject(uri, String.class);
logger.debug(result);
}
}
and the Junit class
#RunWith(SpringRunner.class)
#SpringBootTest(classes = StartApp.class)
public class GetEmpSrvTest01 {
#Test
public void doCall() {
GetEmpSrv getEmpSrv = new GetEmpSrv();
getEmpSrv.getEmps01();
}
}
This is being run inside Eclipse Oxygen.3a (4.7.3a)
in the console it appears Spring Boot is running .. ic the load of h2 db and /emp01 is being mapped however in the Failure Trace of Junit ic
I/O error on GET request for "http://localhost:8080/emp01": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
This makes me think the embedded Tomcat is not running. When I start Spring normally /emp01 returns a JSON as expected.
My question is: Is this type of testing possible with Junit? If so what do I need to do to make it work?

Answer 1

In your test, please autowire TestRestTemplate. The reason is that your spring test will run on another port and the call to http://localhost:8080 will fail.
#RunWith(SpringRunner.class)
#SpringBootTest(classes = StartApp.class)
public class GetEmpSrvTest01 {
#Autowired
TestRestTemplate testRestTemplate;
#Test
public void doCall() {
// without http://localhost:8080, testRestTemplate it will handle it for you
testRestTemplate.getForObject("/emp01", String.class);
}
}
Also you can expect a list of objects in your test:
List<Emp> emps = testRestTemplate.getForObject("/emp01", List.class);