这个类表示远程Order服务，只有一个方法GetOrders，该方法可以根据OrderId来查询Order信息，为了简单起见，如果返回true说明服务调用成功，如果返回false表示调用失败；其中构造函数包含了三个接口，分别用来表示不同用途的接口抽象；IServiceConnection表示对远程服务链接的抽象，IServiceReader表示对不同服务接口读取的抽象，IServiceWriter表示对不同服务接口写入的抽象；这么做可以大化的分解耦合；



using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using NSubstitute;
using UnitTestRefactoring;
namespace UnitTestRefactoring.UnitTests
{
[TestClass]
public class OrderService_UnitTests
{
[TestMethod]
public void OrderService_GetOrders_NormalFlows()
{
IServiceConnection mockServiceConnection = Substitute.For<IServiceConnection>();
IServiceReader mockServiceReader = Substitute.For<IServiceReader>();
IServiceWriter mockServiceWriter = Substitute.For<IServiceWriter>();
OrderService testOrderService = new OrderService(mockServiceConnection， mockServiceReader， mockServiceWriter);
bool testResult = testOrderService.GetOrders("10293884");
Assert.AreEqual(true， testResult);
}
[TestMethod]
public void OrderService_GetOrders_OrderIdIsNull()
{
IServiceConnection mockServiceConnection = Substitute.For<IServiceConnection>();
IServiceReader mockServiceReader = Substitute.For<IServiceReader>();
IServiceWriter mockServiceWriter = Substitute.For<IServiceWriter>();
OrderService testOrderService = new OrderService(mockServiceConnection， mockServiceReader， mockServiceWriter);
bool testResult = testOrderService.GetOrders(string.Empty);
Assert.AreEqual(false， testResult);
}
}
}
using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using NSubstitute;
using UnitTestRefactoring;
namespace UnitTestRefactoring.UnitTests
{
[TestClass]
public class OrderService_UnitTests
{
[TestMethod]
public void OrderService_GetOrders_NormalFlows()
{
IServiceConnection mockServiceConnection = Substitute.For<IServiceConnection>();
IServiceReader mockServiceReader = Substitute.For<IServiceReader>();
IServiceWriter mockServiceWriter = Substitute.For<IServiceWriter>();
OrderService testOrderService = new OrderService(mockServiceConnection， mockServiceReader， mockServiceWriter);
bool testResult = testOrderService.GetOrders("10293884");
Assert.AreEqual(true， testResult);
}
[TestMethod]
public void OrderService_GetOrders_OrderIdIsNull()
{
IServiceConnection mockServiceConnection = Substitute.For<IServiceConnection>();
IServiceReader mockServiceReader = Substitute.For<IServiceReader>();
IServiceWriter mockServiceWriter = Substitute.For<IServiceWriter>();
OrderService testOrderService = new OrderService(mockServiceConnection， mockServiceReader， mockServiceWriter);
bool testResult = testOrderService.GetOrders(string.Empty);
Assert.AreEqual(false， testResult);
}
}
}