[java] How do I mock a REST template exchange?

If anyone is still facing this issue, Captor annotation worked for me

@Captor
private ArgumentCaptor<Object> argumentCaptor;

Then I was able to mock the request by:

ResponseEntity<YourTestResponse> testEntity = new ResponseEntity<>(
    getTestFactoryResponse(), 
    HttpStatus.OK);
when(mockRestTemplate.exchange((String) argumentCaptor.capture(), 
    (HttpMethod) argumentCaptor.capture(), 
    (HttpEntity<?>) argumentCaptor.capture(), 
    (Class<YourTestResponse.class>) any())
).thenReturn(testEntity);

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