嘗試使用Web自動化測試框架WatiN進行TDD

        再次運行測試，看見綠條，測試通過。不過這里只是一個假實現并沒有真正實現查找功能，我們需要對測試進行修改使之更加完善。

 IE ie = new IE("http://localhost:1781/Default.aspx");

 ie.TextField(Find.ById("tb_customerID")).TypeText("ALFKI");
 ie.Button(Find.ById("btn_find_customer")).Click();

 Assert.That(ie.ContainsText("ALFKI"), Is.True);
 Assert.That(ie.ContainsText("Alfreds Futterkiste"), Is.True);

 ie.TextField(Find.ById("tb_customerID")).TypeText("AROUT");
 ie.Button(Find.ById("btn_find_customer")).Click();

 Assert.That(ie.ContainsText("AROUT"), Is.True);
 Assert.That(ie.ContainsText("Around the Horn"), Is.True);

 ie.Close();

        運行測試，又會出現紅條了，測試失敗�，F在要考慮實現一個真正的在數據庫中的查找功能，怎么開始做呢？當然還是由測試開始，有了上面的基礎，現在寫的測試跨庫可以稍微大點：

 [TestFixture]
 public class CustomerDAOTests
 {
     [Test]
     public void ShouldFoundCustomerByID()
     {
         string id = "ALFKI";
         string comName = "Alfreds Futterkiste";

         CustomerDAO customerDAO = new CustomerDAO();
         Customer found = customerDAO.FindCustomerByID(id);
        
         Assert.That(found, Is.Not.Null);
         Assert.That(found.CustomerID, Is.EqualTo(id));
         Assert.That(found.CompanyName, Is.EqualTo(comName));

         id = "AROUT";
         comName = "Around the Horn";
         found = customerDAO.FindCustomerByID(id);

         Assert.That(found, Is.Not.Null);
         Assert.That(found.CustomerID, Is.EqualTo(id));
         Assert.That(found.CompanyName, Is.EqualTo(comName));
     }
 }

    這段代碼不能編譯，因為并沒有CustomerDAO這個類，所以得新增該類以及FindCustomerByID方法，而且上面的測試中已經包括了兩個測試場景，現在可以直接寫實現：

 public class CustomerDAO
 {
     public Customer FindCustomerByID(string id)
     {
         using (NorthwindDataContext ctx = new NorthwindDataContext())
         {
             IQueryable<Customer> customers = ctx.Customers.Where(c => c.CustomerID == id);
             if (customers.Count() > 0)
                 return customers.Single();
             else
                 return null;
         }
     }

 }

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