[FIXED] Mocking a RestTemplate that returns a List in Spring v1.5.14.RELEASE

Issue

I have this RestTemplate that I want to mock

ResponseEntity<List<Hotel>> deliveryResponse =
                    restTemplate.exchange(link.getHref(),
                            HttpMethod.GET, null, new ParameterizedTypeReference<List<Hotel>>() {
                            });

but I don't know if it is possible. I've tried

when(restTemplate.exchange(eq("delivery"), eq(HttpMethod.GET), any(RequestEntity.class), eq(Object.class)))
                .thenReturn(new ResponseEntity<>(new ParameterizedTypeReference<List<Hotel>>(), HttpStatus.OK));

Solution

any(Class)

Matches any object of given type, excluding nulls.

---

any()

Matches anything, including nulls and varargs.

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So as previously suggested changing your test code to the following will solve your issue.

As ParameterizedTypeReference can not be instantiated because it is an abstract class, you could return a mock instead and define the needed behaviour on it.

List<Hotel> hotels = new ArrayList<>();

ResponseEntity response = Mockito.mock(ResponseEntity.class);
Mockito.when(response.getStatusCode()).thenReturn(HttpStatus.OK);
Mockito.when(response.getBody()).thenReturn(hotels);

when(restTemplate.exchange(eq("delivery"), eq(HttpMethod.GET), any(), eq(Object.class)))
    .thenReturn(response);

Answered By - second
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)