How to mock MongoDB repository method in Java

Question

I'm trying to mock the following piece of code in my JUnit test

requestData = requestRepository.findByRequestId(requestId);

by doing

@Mock
RequestRepository requestRepository;

@Mock
RequestData requestData;

Mockito.when(requestRepository.findByRequestId(requestId)).thenReturn(requestData);

But instead of giving the mock object back, i'm getting null value. What is the correct way to mock MongoDB repository methods.

this is the correct way. Probably you requestId value during test execution is not the same as the one used to mock call. — Juan Rada
– Juan Rada, Commented Jan 22, 2020 at 10:55
But instead of giving the mock requestData object, its going to the mongodb and fetching data from there. I want it to send back the mock object. — user387600
– user387600, Commented Jan 22, 2020 at 11:14
I see @Mock will work only if you call MockitoAnnotations.initMocks(this); or if you are using @RunWith(MockitoJUnitRunner.class). If your test is going directly to the db is because probably you are running with SpringRunner which is starting your full application, and this is actually an integration test — Juan Rada
– Juan Rada, Commented Jan 22, 2020 at 11:17
Yes I'm running with SpringRunner So is there anyway to get mock object instead of actual data from db. — user387600
– user387600, Commented Jan 22, 2020 at 11:23

Juan Rada · Accepted Answer · 2020-01-28 11:22:22Z

2

When using SpringRunner based test, use @MockBean to declare mock of your context beans.

answered Jan 28, 2020 at 11:22

Juan Rada

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GnanaJeyam · Accepted Answer · 2020-01-22 19:40:08Z

0

If you don't know about your request id value (it may be a dynamic value) on that case you can use Mock.any(<?>.class).

Example:

Mockito.when(requestRepository.findByRequestId(Long.class)).thenReturn(requestData);

The above example is only for requestId of type Long, if you need integer then you need to change the class to Integer.

answered Jan 22, 2020 at 19:40

GnanaJeyam

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