Moq在.net中比較出名的mock框架，NSubstitute也是屬于這類框架，使用方式也如出一轍，是通過實現子類來達到mock的效果。下面的測試方法都是按照 UnitTest的三板斧Arrange Act Assert來展開的，代碼具體如下。

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方法發生異常_userService.AddUserAsync(Arg.Any<User>()).Throws(new Exception("異常")); 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){//這個邏輯沒有設用到接口，所以不需要mockvar user = new User { UserName = userName, Password = password }; var result = await _userManage.AddUserAsync(user);Assert.Equal(false, result);}}//被測試的類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);}//實體public class User{public string UserName { get; set; }public string Password { get; set; }} }

單元測試結果

覆蓋率結果

更復雜的調用參看官方文檔：https://nsubstitute.github.io/help/getting-started/

總結

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