How to verify in Mockito if the entity class setter is not called

Question

I have a class, which I want to unit test using mockito:

public class ServiceImpl {

    @Autowired
    private TestDao testDao;

    @Transactional
    public void setData(Long id) {
        TestClass testClass = testDao.findOne(id);
        if (testClass != null) {
            testClass.setStatus(true);
        }
    }
}

I need to test this class. So I have created the Test class as below:

@RunWith(MockitoJUnitRunner.class)
public class ServiceImplTest{
    @Mock
    private TestDao testDao;

    @InjectMocks
    private ServiceImpl service;

    @Test
    public void setData_success() {
        TestClass testClass = new TestClass();
        when(testDao.findOne(1L)).thenReturn(testClass);
        service.setData(1L);
        assertTrue(testClass.getStatus());
    }
}

The above scenario is when the testClass object is present. Similarly i want to test, the scenario when the testClass object is null. Something like:

 @Test
 public void setData_testClass_null() {
    TestClass testClass = null;
    when(testDao.findOne(1L)).thenReturn(testClass);
    service.setData(1L);
    //how to I verify here that testClass.setStatus(true) is never called????
   //or should I just ignore the test case?
  }