研究了一周的单元测试，现在勉强算是摸到了门槛，现整理笔记如下：
　　项目架构是简单的工厂模式，对应代码为：
　　DAL
using System.Collections.Generic;
using MetalsExchange.IDAL;
using MetalsExchange.DBUtility;
using MetalsExchange.Model;
namespace MetalsExchange.SQLServerDAL
{
public class Employee: IEmployee
{
public IList<CustomerInfo> GetCustomerList()
{
IList<CustomerInfo> list = new List<CustomerInfo>();
return list;
}
}
}
　　IDAL
using System.Collections.Generic;
using MetalsExchange.Model;
namespace MetalsExchange.IDAL
{
public interface IEmployee
{
IList<CustomerInfo> GetCustomerList();
}
}
　　BLL
using System.Collections.Generic;
using MetalsExchange.Model;
using MetalsExchange.IDAL;
namespace MetalsExchange.Bll
{
public  class EmployeeBll
{
public IEmployee dal = DALFactory.DataAccess.CreateEmployee();
public IList<CustomerInfo> GetCustomerList()
{
return dal.GetCustomerList();
}
}
}
　　DALFactory
using System.Configuration;
using System.Reflection;
namespace MetalsExchange.DALFactory
{
public class DataAccess
{
private static  string path {
get {
string _path= ConfigurationManager.AppSettings["WebDAL"];
if (_path == null)
_path = "MetalsExchange.SQLServerDAL";
return _path;
}
}
public static IDAL.IEmployee CreateEmployee()
{
string className = path + ".Employee";
return (IDAL.IEmployee)Assembly.Load(path).CreateInstance(className);
}
}
}
　　最开始就卡在这里，一度以为静态方法无法单元测试，后来发现原因是因为ConfigurationManager.AppSettings["WebDAL"]取不到值，因为测试项目里面没有config文档，目前我采用了最简单的方法来解决，最好的方法是将这个方法重新封装
　　单元测试
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections.Generic;
using Moq;
using MetalsExchange.IDAL;
using MetalsExchange.Model;
namespace MetalsExchange.Bll.Tests
{
[TestClass()]
public class EmployeeBllTests
{
[TestMethod()]
public void GetCustomerListTest()
{
//arrange
var mock = new Mock<IEmployee>();
mock.Setup(customer => customer.GetCustomerList()).Returns(new List<CustomerInfo>());
EmployeeBll employee = new EmployeeBll();
//art
IList<CustomerInfo> list = employee.GetCustomerList();
mock.Verify();
//assert
Assert.ReferenceEquals(list， mock.Object.GetCustomerList());
}
}
}
　　工厂类是一个静态类，其实也可以做单元测试
using Microsoft.VisualStudio.TestTools.UnitTesting;
using MetalsExchange.IDAL;
namespace MetalsExchange.DALFactory.Tests
{
[TestClass()]
public class DataAccessTests
{
[TestMethod()]
public void CreateEmployeeTest()
{
IEmployee dal = DataAccess.CreateEmployee();
Assert.IsNotNull(dal);
}
}
}