验证Mongo DB单元模拟单元测试

Question

我创建了一个模拟测试，用于测试插入到mongodb数据库中。我想知道如何验证单元测试。方法插入返回一个空值。那么我该如何验证？另外，某些方法不会返回void。我该如何验证呢？

@Repository
public class DataDao<T> implements {

    @Autowired
    private MongoOperations mongoOps;

    public DataDao(MongoOperations mongoOps) {
        this.mongoOps = mongoOps;
    }

    @Override
    public void insert(Class<T> t, List<T> t1) {
        this.mongoOps.insert(t1, t);
    }
}

public class DataDaoTest {

    @Mock
    private DataDao<Data> daoMock;

    public static List<Data> getData() {
        // returns a list here
    }

    @Before
    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void testInsert() {
        List<Data> data = getData();
        daoMock.insert(Data.class, data);

    }
}