Unable to mock in unit test for Configuration in Spring boot - spring

Question

I am getting issue while writing unit test for following configuration:
#Configuration
public class XYZProvider {
private static Logger logger = LoggerFactory.getLogger(this.class);
private final Operations operations;
public XYZProvider(Operations operations) {
this.operations = operations;
}
#PostConstruct
public void process() {
try {
File[] files = operations.process(Constants.DIR); <---HERE I AM GETTING NULL FOR OPERATIONS EVEN AFTER MOCKING
...
}
Operations class is as follows:
#Component
public class Operations {
public File[] process(String dir) throws IOException {
...
}
}
Test file is as follows:
#RunWith(MockitoJUnitRunner.class)
public class XYZProviderTest {
#Mock
Operations operations;
#InjectMocks
XYZProvider xyzProvider;
#Test
public void test_Success() throws IOException {
when(operations.process(Constants.DIR))
.thenReturn(getFiles("tests/success"));
xyzProvider.process();
...
}
While running unit tests, I am getting null for operations. I am not getting idea how to fix this.

Answer 1

Some things to try:
when(operations.process(Constants.DIR))
You need to use a Matcher instead of Constans.DIR. In Mockito 2 this would be
when(operations.process(ArgumentMatchers.eq(Constants.DIR)))
And if your Operations is null in XYXProvider I would try:
#Test
public void test_Success() throws IOException {
Operations operations = Mockito.mock(Operations.class);
XYZProvider provider = new XYZProvider(operations);
when(operations.process(Constants.DIR))
.thenReturn(getFiles("tests/success"));
xyzProvider.process();
...
}
If that works you can move this to a BeforeTest-Method. You can also try:
#Mock
Operations operations;
#InjectMocks
XYZProvider xyzProvider = new XYZProvider(operations);