用NSubstitute来mock

Moq在.net中比较出名的mock框架，NSubstitute也是属于这类框架，使用方式也如出一辙，是通过实现子类来达到mock的效果。下面的测试方法都是按照 UnitTest的三板斧Arrange Act Assert来展开的，代码具体如下。

using Microsoft.VisualBasic;
using NSubstitute;
using NSubstitute.ExceptionExtensions;
using System;
using System.Threading.Tasks;
using Xunit;namespace NSubstituteUnitTest
{public class UserManageUnitTest{IUserService _userService;UserManage _userManage;public UserManageUnitTest(){//mock接口_userService = Substitute.For<IUserService>();_userManage = new UserManage(_userService);}[Fact]public async Task AddUser_Default_Return(){var user = new User { UserName = "a", Password = "b" };//mock方法的返回值_userService.AddUserAsync(Arg.Any<User>()).Returns(true);          var result = await _userManage.AddUserAsync(user);Assert.Equal(true, result);}[Fact]public async Task AddUser_ServiceError_ReturnFalse(){          var user = new User { UserName = "a", Password = "b" };//mock方法的返回值_userService.AddUserAsync(Arg.Any<User>()).Returns(false);          var result = await _userManage.AddUserAsync(user);Assert.Equal(false, result);}[Fact]public async Task AddUser_Exception_ReturnFalse(){         var user = new User { UserName = "a", Password = "b" };//mock方法发生异常_userService.AddUserAsync(Arg.Any<User>()).Throws(new Exception("异常"));       var result = await _userManage.AddUserAsync(user);Assert.Equal(false, result);}[Theory][InlineData("", "a")][InlineData("a", "")][InlineData("", "")][InlineData(null, "a")][InlineData("a", null)][InlineData(null, null)][InlineData(" ", "a")][InlineData("a", " ")][InlineData(" ", " ")]public async Task AddUser_IsNullOrEmpty_ReturnFalse(string userName, string password){//这个逻辑没有设用到接口，所以不需要mockvar user = new User { UserName = userName, Password = password }; var result = await _userManage.AddUserAsync(user);Assert.Equal(false, result);}}//被测试的类public class UserManage{private readonly IUserService _userService;public UserManage(IUserService userService){_userService = userService;}public async Task<bool> AddUserAsync(User user){try{if (!string.IsNullOrEmpty(user.UserName.Trim()) && !string.IsNullOrEmpty(user.Password.Trim())){return await _userService.AddUserAsync(user);}else{return false;}}catch{return false;}}}//接口public interface IUserService{Task<bool> AddUserAsync(User user);}//实体public class User{public string UserName { get; set; }public string Password { get; set; }}
}

单元测试结果