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我正在使用 DbUnit 测试我的 DAO 层。我正在从 XML 数据集预填充数据库,执行一些操作,然后针对已知结果进行断言。

Assertion.assertEquals(expectedDataSet, actualDataSet);

数据集包含带有浮点数的列。然后比较这些列,我得到:

junit.framework.ComparisonFailure: value (table=OrderLine_T, row=2, col=price) expected:<2.99[]> but was:<2.99[0000009536743]>.

值相等,但由于浮点数不能以二进制形式精确表示,因此断言失败。在 JUnit 中,我们有assertEquals(double expected, double actual, double delta). 我们如何在 DbUnit 中设置一些增量来进行浮点数比较?

初始数据集:

<dataset>
    <Customer_T id="1" name="Anthony"/>
    <Customer_T id="2" name="John"/>

    <Order_T id="1" date="2012-06-07 14:30" customer_id="1" />
    <Order_T id="2" date="2012-06-07 15:31" customer_id="2" />

    <OrderLine_T id="1" order_id="1" product_id="1" price="2.99" quantity="5" />
    <OrderLine_T id="2" order_id="2" product_id="2" price="3.49" quantity="10" />
</dataset>

预期结果:

<dataset>
    <Customer_T id="1" name="Anthony"/>
    <Customer_T id="2" name="John"/>

    <Order_T id="1" date="2012-06-07 14:30" customer_id="1" />
    <Order_T id="2" date="2012-06-07 15:31" customer_id="2" />

    <OrderLine_T id="1" order_id="1" product_id="1" price="2.99" quantity="5" />
    <OrderLine_T id="2" order_id="2" product_id="2" price="3.49" quantity="10" />

<!--     Below added -->
    <Order_T id="3" date="1987-06-07 9:15:10" customer_id="2" />
    <OrderLine_T id="3" order_id="3" product_id="1" price="2.99" quantity="2" />
    <OrderLine_T id="4" order_id="3" product_id="5" price="3.55" quantity="8" />
</dataset>

代码:

/* Should save order correctly (including order lines) */
    @Test
    public void save() throws Exception {
        /* Create new order */
        Set<OrderLine> lines = new HashSet<OrderLine>();
        lines.add(new OrderLine(1, (float)2.99, 2));
        lines.add(new OrderLine(5, (float)3.55, 8));

        Calendar cal = Calendar.getInstance();
        cal.set(1987, 6, 7, 9, 15, 10);
        Date date = cal.getTime();

        Customer customer = customerDAO.findById(2); // John

        Order order = new Order(date, lines, customer);
        orderDAO.save(order);
        entityManager.flush();

        /* Assert order is saved */
        IDataSet expectedDataSet = new FlatXmlDataSetBuilder().build(Thread.currentThread()
                                                                           .getContextClassLoader()
                                                                           .getResourceAsStream("data-set-afterAddOrder.xml"));
        IDataSet actualDataSet = getDatabaseConnection().createDataSet();

        Assertion.assertEquals(expectedDataSet, actualDataSet);
    }

编辑:

可能需要提及我正在使用的内存 HSQLDB。刚试了mysql,成功通过了。

尝试设置ToleratedDelta没有成功:

IDatabaseConnection connection = new DatabaseConnection(((SessionImpl) (entityManager.getDelegate())).connection());
HsqldbDataTypeFactory dataTypeFactory = new HsqldbDataTypeFactory();
dataTypeFactory.addToleratedDelta(new ToleratedDelta("OrderLine_T", "price", 0.01));
connection.getConfig().setProperty(DatabaseConfig.PROPERTY_DATATYPE_FACTORY, dataTypeFactory);

编辑2:

我正在使用 hibernate.hbm2ddl.auto = create,将架构导出到数据库。从 fredt得到想法后,我将实体上的字段价格类型更改为 BigDecimal 并添加了额外的列精度和比例参数:

@Column(precision=10, scale=4)
private BigDecimal price;

这被翻译成PRICE NUMERIC(10,4). 问题解决了,感谢fredt

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1 回答 1

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如果将列定义为 DECIMAL 或 NUMERIC 并具有所需的精度和小数位数,则该值将具有小数点后的 exace 位数,可以避免此问题。

于 2012-08-15T20:10:35.397 回答