I am using spring data JPA for creating services and for unit testing I am using Junit and mockito. In following code I am trying to do junit testing for service class.
Room account mapping service class is dependent on Room Investigator mapping service class so I used mockito for mocking room Investigator mapping service class method but that method calling one more method of same class.
I tried like below but I am getting error in mockito. Can any one please tell me how I can do mocking?
TestRoomAccountMappingService class
public class TestRoomAccountMappingService { @MockBean RoomAccountMappingRepository roomAccountMapRepository; @Autowired RoomAccountMappingService roomAccountMappingService; @Autowired RoomInvestigatorMappingService roomInvestMapService; @Test public void deleteAccountMapping() { Integer[] RoomAllocationId= {1839}; //here getting error Mockito.when(roomInvestMapService.returnRoomWithinClusterByRoomAllocationID(1839)).thenReturn(RoomAllocationId); RoomAccountMapping roomAcctMap= new RoomAccountMapping(); roomAcctMap.setnRoomAllocationId(1); List<RoomAccountMapping> roomList= new ArrayList<>(); roomList.add(roomAcctMap); Mockito.when(roomAccountMapRepository.findByNRoomAllocationId(1839)).thenReturn(roomList); Boolean actual = roomAccountMappingService.deleteAccountMapping(1839); assertEquals(true, actual ); } } Failure Trace
org.mockito.exceptions.misusing.MissingMethodInvocationException: when() requires an argument which has to be 'a method call on a mock'. For example: when(mock.getArticles()).thenReturn(articles); Also, this error might show up because: 1. you stub either of: final/private/equals()/hashCode() methods. Those methods *cannot* be stubbed/verified. Mocking methods declared on non-public parent classes is not supported. 2. inside when() you don't call method on mock but on some other object. at com.spacestudy.service.TestRoomAccountMappingService.deleteAccountMapping(TestRoomAccountMappingService.java:39) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
