Why code in not covered for verify in mokito? - junit

Question

This is the service file which has save method. This method is not covering in code coverage. These repository's noting but just a jpa repository's
#Service
public class ProcessFileService {
#Autowired
private ProcessFileRepository processFileRepository;
#Autowired
private ProcessRunRepository processRunRepository;
#Transactional
public void save(ProcessRun processRun, List<ProcessFile> processFiles) {
processRunRepository.save(processRun);
for (ProcessFile processFile : processFiles) {
processFile.setProcessRun(processRun);
processFileRepository.save(processFile);
}
}
}
This is the Test class and its done by verify()
#ExtendWith(MockitoExtension.class)
public class ProcessFileServiceTest {
#Mock
private ProcessFileRepository processFileRepository;
#Mock
private ProcessRunRepository processRunRepository;
#Test
void ProcessSave() {
ProcessRun processRun = new ProcessRun();
processRun.setEndDateTime("30/08/2022");
processRun.setNumFilesFailed(1L);
processRun.setNumFilesProcessed(1L);
processRun.setNumFilesTransferred(1L);
processRun.setStartDateTime("30/08/2022");
ProcessFile processFile = new ProcessFile();
processFile.setCurrentRetryAttempt(1);
processFile.setFileName("file.txt");
processFile.setSuccessfulYN(true);
processFile.setTransferDateTime("30/08/2022");
List<ProcessFile> processFiles = new ArrayList<ProcessFile>();
processFiles.add(processFile);
ProcessFileService processFileService = mock(ProcessFileService.class);
doNothing().when(processFileService).save(processRun, processFiles);
processFileService.save(processRun, processFiles);
verify(processFileService, times(1)).save(processRun, processFiles);
}
}
Please help me here what is i am missing here, i am new to junit.

Answer 1

You mocked your object under test, and in addition, stubbed method under test to do nothing (which by the way is the default behaviour for mocks).
You need to construct a proper instance of class under test, not mock it.
With MockitoExtension, a simple way to do this is:
#ExtendWith(MockitoExtension.class)
public class ProcessFileServiceTest {
#Mock
private ProcessFileRepository processFileRepository;
#Mock
private ProcessRunRepository processRunRepository;
#InjectMocks
ProcessFileService processFileService
...
}