Mock a new Object created at class level

Question

I have a SenderService class as shown below.

I am using the restTemplate object to call a url. How should I write a junit test for this by ONLY using Mockito ?

I have already tried creating a spy for my class but its not working

@Service public class SenderServiceImpl implements SenderService{ @Autowired private Logger logger; private RestTemplate restTemplate = new RestTemplate(); @Override public void sendNotification(SenderNotification notification) { try { HttpEntity sendRequestBody = new HttpEntity<> (notification,headers); response = restTemplate.postForEntity(url,sendRequestBody,String.class); } }

Pass in a RestTemplate instance to the constructor of SenderServiceImpl so that you can mock it, instead of creating it inside the class — Tim
– Tim, Commented Apr 19, 2019 at 12:02
PS : I cannot make changes in the code as its not owned by me — Roshni
– Roshni, Commented Apr 19, 2019 at 12:04
Then why are you testing it? You won't be able to fix any bug you might find anyway. You can use the Mock and InjectMocks annotations (static.javadoc.io/org.mockito/mockito-core/2.27.0/org/mockito/…), but something is seriously wrong if you're supposed to unit test code that you're not allowed to modify. — JB Nizet
– JB Nizet, Commented Apr 19, 2019 at 12:06
Possible duplicate of Mockito: Mock private field initialization — Wojtek Mlodzianowski
– Wojtek Mlodzianowski, Commented Apr 19, 2019 at 12:14
You can possibly use powermock (automationrhapsody.com/mock-new-object-creation-powermock). But this is not clean solution. — Failed
– Failed, Commented Apr 19, 2019 at 12:14

Wojtek Mlodzianowski · Accepted Answer · 2019-04-19 12:55:49Z

I agree with the comments-this code needs dependency injection and should rather be fixed. If you really want to mock field you can use PowerMock or the solution from this question: Mockito: Mock private field initialization

Mockito comes with a helper class to save you some reflection boiler plate code:

import org.mockito.internal.util.reflection.Whitebox; //... @Mock private Person mockedPerson; private Test underTest; // ... @Test public void testMethod() { Whitebox.setInternalState(underTest, "person", mockedPerson); // ... }

omg silly me, it supposed to be "this code needs dependency injection"

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