JUnit Test cases for Rest URL - rest

Question

I am facing problem to write test cases for a rest url which calls another URL through Rest Template.
Please find my code below:-
#RestController
public class ParentController{
#Value("${child.url}")
private String childUrl;
#Autowired
private RestTemplateUtil restTemplateUtil;
#RequestMapping(value = "/parent",method = RequestMethod.POST)
public ResponseEntity<Object> callChildController(#RequestBody InputParam inputParam, HttpServletRequest request) {
return restTemplateUtil.templateService(restTemplateUtil.formURL(request, childUrl), HttpMethod.POST,null,inputParam, Object.class);
}}
}
#Service
public class RestTemplateUtil {
RestTemplate restTemplate = new RestTemplate();
public ResponseEntity<Object> templateService(String url, HttpMethod method, HttpHeaders headers, ...............){
logger.info("Rest template service called..");
response = restTemplate.exchange(url,method,entity,responseType);
return response;
}
public String formURL(HttpServletRequest request, String childUrl){
return "http://" + request.getServerName() + ":" + request.getServerPort() + childUrl;
}
}
JUnit Test case written:-
Mockito.when(restTemplateUtil.templateService(Mockito.anyString(),
Mockito.<HttpMethod> eq(HttpMethod.POST),
Mockito.<HttpHeaders> any(),
Mockito.<HttpEntity<?>> any(),
Mockito.<Class<Object>> any())).thenReturn(mockRespEntity);
this.mvc.perform(post("/parent")
.contentType(MediaType.APPLICATION_JSON)
.content(new ObjectMapper().writeValueAsString(requestObj)))
.andExpect(status().is2xxSuccessful());
I am a newbie to Mockito, so with my meagre knowledge have build the above test case.
Please advise and correct me if I am wrong.
On executing this, I am getting error:-
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:80/child": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect
The portno is wrong here.
Please help.
Thanks.