There is a private method in a springBatch Beans. configuration class.

@Slf4j
public class EodDataDumpSpringBatchConfig {

private Resource getWriterResource(StepExecution stepExecution, Storage storage) {
        String chunkUri = stepExecution.getJobParameters().getString(EodDataDumpConstants.CHUNK_URI);
        String fileUri = chunkUri + stepExecution.getStepName();
        Resource resource = new GoogleStorageResource(storage, fileUri);
        return resource;
    }

....

}

I am writing a springBatchTest:

@SpringBatchTest
@EnableAutoConfiguration
@SpringJUnitConfig({EodDataDumpSpringBatchConfig.class})
@ExtendWith(MockitoExtension.class)
@TestPropertySource(locations = "classpath:application.properties")
@MockitoSettings(strictness = Strictness.LENIENT)
public class EodDataDumpSpringBatchTest {

@Value("file:src/test/resources/storageFile.csv")
    private Resource resource;

@Test
    public void dataDumpJobEndToEndTest() throws Exception {
        
    }

}

I want to mock the private method in when().thenReturn statement.
What I mean is, when any method calls that private method it should get a mocked Resource.

I tried:

1. ReflectionUtils
2. PoweMockit