MbUnit3.0较之2.0在数据驱动测试方面有很大的提高，下文尝试将数据驱动的测试运用于TDD。

问题：

在TDD的过程中，对于持久层数据的单元测试一直是一个很头大的问题，就数据逻辑本身，可能并不负责，但大量可读性较差的数据（几十条记录硬编码到代码中，想必测试代码的维护工作也大得很），对于单元测试的维护造成了很大麻烦。

解决方案：

使用MbUnit3中数据驱动测试的概念，是解决持久层数据单元测试的一个很好方法。

下面举个简单的例子，来对持久层的一个简单地Query功能进行单元测试；

接口定义如下：

    public interface IItemRepository
    {
        IList<ItemPersistence> Query(ItemQuery query);
    }

Model定义:

    public class ItemPersistence
    {
        public Int32?   Id { get; set; }
        public Int32? EntityId { get; set; }
        public Int32? TypeId { get; set; }
        public String Type { get; set; }
        public String Item { get; set; }
        public float? Amount { get; set; }
        public String Description { get; set; }
        public DateTime BillDate { get; set; }
        public String   RecordOperator { get; set; }
    }

   public class ItemRepository : IItemRepository
    {
        public IList<ItemPersistence> Query(ItemQuery query,out int total)
        {
            throw new NotImplementedException();
        } 
    }

        [Test]
        [XmlData("//QueryById/item",FilePath = @"Data\Items.xml")]
        public void TestQueryById(
            [Bind("id")] Int32? id,[Bind("entityId")] Int32? entityId,[Bind("name")] String name,[Bind("billDate")] String billDate,[Bind("type")] String type,[Bind("amount")] float amount,[Bind("description")] String description,[Bind("operator")] String recordOperator)
        {
            var expectedItem = new ItemPersistence
                            {
                                Id = id,EntityId = entityId,Type = type,Item = name,BillDate = DateTime.Parse(billDate),Amount = amount,Description = description,RecordOperator = recordOperator
                            };

            

            // run
            Int32 rTotal;
            var rItem = _target.Query(new ItemQuery { Id = expectedItem .Id},out rTotal);

            // verify
            Assert.AreEqual(1,rTotal);
            Assert.AreEqual(expectedItem.Id,rItem[0].Id);
            Assert.AreEqual(expectedItem.EntityId,rItem[0].EntityId);
            Assert.AreEqual(expectedItem.BillDate.ToString("yyyy-MM-dd"),rItem[0].BillDate.ToString("yyyy-MM-dd"));
            Assert.AreEqual(expectedItem.Type,rItem[0].Type);
            Assert.AreEqual(expectedItem.Item,rItem[0].Item);
            Assert.AreEqual(expectedItem.Amount,rItem[0].Amount);
            Assert.AreEqual(expectedItem.Description,rItem[0].Description);
            Assert.AreEqual(expectedItem.RecordOperator,rItem[0].RecordOperator);
        }

<?xml version="1.0" encoding="utf-8" ?>
<shoppingCart>
  <QueryById>
    <item>
      <id>1</id>
      <entityId>1</entityId>
      <billDate>2011-01-01</billDate>
      <type>MARSHOSAURUS BICENTESIMUS</type>
      <name>OTHNIELIA REX</name>
      <amount>16.79</amount>
      <description>GENT</description>
      <operator>ALYCE</operator>
    </item>
    <item>
      <id>2</id>
      <entityId>2</entityId>
      <billDate>2011-01-02</billDate>
      <type>MEGALOSAURUS CLOACINUS</type>
      <name>PECTINODON BAKKERI</name>
      <amount>52.83</amount>
      <description>POSTPROCESS</description>
      <operator>SILVANUS</operator>
    </item>
    <item>
      <id>3</id>
      <entityId>1</entityId>
      <billDate>2011-01-03</billDate>
      <type>IGUANODON SUESSI</type>
      <name>ARCHAEORNITHOIDES DEINOSAURISCUS</name>
      <amount>58.76</amount>
      <description>PILGRIM</description>
      <operator>THORNTON</operator>
    </item>
    <item>
      <id>4</id>
      <entityId>2</entityId>
      <billDate>2011-01-04</billDate>
      <type>DYSALOTOSAURUS LETTOW-VORBECKI</type>
      <name>SHANTUNGOSAURUS GIGANTEUS</name>
      <amount>65.92</amount>
      <description>EMPTIES</description>
      <operator>HAYWOOD</operator>
    </item>
    <item>
      <id>5</id>
      <entityId>2</entityId>
      <billDate>2011-01-05</billDate>
      <type>MICROCERATOPS SULCIDENS</type>
      <name>TALARURUS PLICATOSPINEUS</name>
      <amount>11.31</amount>
      <description>WORKBENCH</description>
      <operator>STTELLA</operator>
    </item>
  </QueryById>
</shoppingCart>