[Fact]public async Task VisitDataCompressExport_ShouldReturnEmptyResult_WhenFileTokenDoesNotExist(){  // arrange  var mockFiletokenStore = new Mock<IFileTokenStore>();  mockFiletokenStore    .Setup(it => it.Get(It.IsAny<string>()))    .Returns(string.Empty);  var controller = new StatController(    mockFiletokenStore.Object,    null);  // act  var actual = await controller.VisitDataCompressExport("faketoken");  // assert  Assert.IsType<EmptyResult>(actual);}

[Theory][InlineData(null)][InlineData("a")]public void Add_InputNullOrAlphabetic_ThrowsArgumentException(string input){  // arrange  var stringCalculator = new StringCalculator();  // act  Action actual = () => stringCalculator.Add(input);  // assert  Assert.Throws<ArgumentException>(actual);}

<被测试方法全名>_<期望的结果>_<给予的条件>// 例子[Fact]public void Add_InputNullOrAlphabetic_ThrowsArgumentException(){ ...}

// xUnitAssert.True()Assert.Equal()// MsTestAssert.IsTrue()Assert.AreEqual()

public class UserController{  private readonly IUserService _userService;    public UserController(IUserService userService)  {    _userService = userService;  }    [HttpGet("{id}")]  public IActionResult GetUser(int id)  {    var user = _userService.GetUser(id);        if (user == null)    {      return NotFound();    }    else    {      ...    }  }}

[Fact]public void GetUser_ShouldReturnNotFound_WhenCannotFoundUser(){  // arrange  // 新建一个IUserService的mock对象  var mockUserService = new Mock<IUserService>();  // 使用moq对IUserService的GetUs方法进行mock: 当入参为233时返回null  mockUserService   .Setup(it => it.GetUser(233))   .Return((User)null);  var controller = new UserController(mockUserService.Object);    // act  var actual = controller.GetUser(233) as NotFoundResult;    // assert  // 验证调用过userService的GetUser方法一次，且入参为233  mockUserService.Verify(it => it.GetUser(233), Times.AtMostOnce());}

[Fact]public void IntroductoryTest(){  // arrange  Fixture fixture = new Fixture();  int expectedNumber = fixture.Create<int>();  MyClass sut = fixture.Create<MyClass>();    // act  int result = sut.Echo(expectedNumber);    // assert  Assert.Equal(expectedNumber, result);}

[Theory, AutoData]public void IntroductoryTest(  int expectedNumber, MyClass sut){  // act  int result = sut.Echo(expectedNumber);    // assert  Assert.Equal(expectedNumber, result);}

// 1. 测试时创建一个模拟的List<T>var users = new List<UserEntity>(){ new UserEntity{LastName = "ExistLastName", DateOfBirth = DateTime.Parse("01/20/2012")}, ...};// 2. 通过扩展方法转换成DbSet<UserEntity>var mockUsers = users.AsQueryable().BuildMock();// 3. 赋值给给mock的DbContext中的Users属性var mockDbContext = new Mock<DbContext>();mockDbContext .Setup(it => it.Users) .Return(mockUsers);

public static class LoggerHelper{  public static Mock<ILogger<T>> LoggerMock<T>() where T : class  {    return new Mock<ILogger<T>>();  }  public static void VerifyLog<T>(this Mock<ILogger<T>> loggerMock, LogLevel level, string containMessage, Times times)  {    loggerMock.Verify(    x => x.Log(      level,      It.IsAny<EventId>(),      It.Is<It.IsAnyType>((o, t) => o.ToString().Contains(containMessage)),      It.IsAny<Exception>(),      (Func<It.IsAnyType, Exception, string>)It.IsAny<object>()),    times);  }  public static void VerifyLog<T>(this Mock<ILogger<T>> loggerMock, LogLevel level, Times times)  {    loggerMock.Verify(    x => x.Log(      level,      It.IsAny<EventId>(),      It.IsAny<It.IsAnyType>(),      It.IsAny<Exception>(),      (Func<It.IsAnyType, Exception, string>)It.IsAny<object>()),    times);  }}

[Fact]public void Echo_ShouldLogInformation(){  // arrange  var mockLogger = LoggerHelpe.LoggerMock<UserController>();  var controller = new UserController(mockLogger.Object);    // act  controller.Echo();    // assert  mockLogger.VerifyLog(LogLevel.Information, "hello", Times.Once());}