Mock RestTemplate return null

Question

I need to mock restTemplate for a simple request:

HttpEntity<RequestVO> request = new HttpEntity<>(new RequestVO(),new HttpHeaders());
restTemplate.postForEntity("URL", request , ResponseVO.class);

But I'm getting null on postForEntity request:

ResponseVO respVO = new ResponseVO();
respVO.setEntry("https://www.test.com");
ResponseEntity<Object> resp =new ResponseEntity<>(
    respVO,
    HttpStatus.OK
);      
when(restTemplate.postForEntity(any(), any(), any())).thenReturn(resp);

Tried to follow similar solution, I'm mocking relevant objects:

@Mock
HttpHeaders httpHeaders;
@Mock
ResponseEntity responseEntity;
@Mock   
private RestTemplate restTemplate;

EDIT Same null results when tried similar tries as @JoãoDias suggested

when(restTemplate.postForEntity(anyString(), any(HttpEntity.class), eq(ResponseVO.class))).thenReturn(resp);

Have you tried `when(restTemplate.postForEntity(anyString(), any(HttpEntity.class), eq(ResponseVO.class))).thenReturn(resp);`? — João Dias, Dec 05 '21 at 14:15

Ori Marko · Accepted Answer · 2021-12-07T13:09:46.653

Succeeded with MockRestServiceServer:

@Autowired
private RestTemplate restTemplate;

private MockRestServiceServer mockServer;
@BeforeClass
public void initMocks() {       
    mockServer = MockRestServiceServer.createServer(restTemplate);
}
...
mockServer.expect(ExpectedCount.once(), 
              requestTo(new URI("URL")))
              .andExpect(method(HttpMethod.POST))
              .andRespond(withStatus(HttpStatus.OK)
              .contentType(MediaType.APPLICATION_JSON)
              .body("EXPECTED")

MockRestServiceServer actually works by intercepting the HTTP API calls using a MockClientHttpRequestFactory. Based on our configuration, it creates a list of expected requests and corresponding responses. When the RestTemplate instance calls the API, it looks up the request in its list of expectations, and returns the corresponding response.

I have the same issue but I couldn't fix it. How can I fix it? Here is the link : https://stackoverflow.com/questions/76308882/spring-boot-junit-test-resttemplate-returns-null-in-servicetest — S.N, May 22 '23 at 20:31

Mock RestTemplate return null

1 Answers1