Autofac.Extras.Moq-模拟登录的响应不包含预期值

Question

我想在我的应用程序中进行单元测试。我使用NUNIT和以下库：

• Autofac.Extras.Moq
• AutoFixture

我跟踪了这些样本，但它不起作用：

• http://makanda.io/unit-testing-xamarin-forms-view-model/
• 用Moq&AutoMock

这是我的测试：

private Fixture _fixture;
[SetUp]
public void Setup()
{
_fixture = new Fixture();
}
[Test]
public void Login_Success()
{
using (var mock = AutoMock.GetLoose())
{
var infosLogin = _fixture.Create<LoginRequest>();
var loginResponse = _fixture.Create<LoginResponse>();
var userService = mock.Mock<IUserService>();
userService
.Setup(user => user.Login(infosLogin))
.Returns(Task.FromResult(loginResponse));
var viewModel = new MainPageViewModel(new ContentPage(), userService.Object);
viewModel.Login = infosLogin.Username;
viewModel.Password = infosLogin.Password;
viewModel.LoginCommand.Execute(null);
}
}

我的视图

public MainPage()
{
InitializeComponent();
BindingContext = new MainPageViewModel(this, new UserServiceImpl());
}

我的ViewModel

public MainPageViewModel(Page page, IUserService userService)
{
_page = page;
_userService = userService;
Login = "";
Password = "";
}
public Command LoginCommand
{
get
{
return new Command(async () =>
{
Console.WriteLine("step 1...");
if (!string.IsNullOrEmpty(Login) && !string.IsNullOrEmpty(Password))
{
Console.WriteLine("step 2...");
var infos = new LoginRequest() { Username = "Wyllis", Password = "test" };
LoginResponse response = await _userService.Login(infos);
Console.WriteLine("step 3...");
Console.WriteLine(response);
Age = response.Age; // Got error : Object reference not set to an instance of an object
}
});
}
}

登录响应模型

public class LoginResponse
{
public string Username { get; set; }
public string Age { get; set; }
}

Age = response.Age;，我得到错误：对象引用没有设置为对象的实例，你能解释出什么问题吗？

Answer 1

我找到了解决方案，我的视图模型中的new LoginRequest(...)和我的测试是相同的，但哈希码(内存地址(不同，所以我的测试失败了，因为我的参数不是与视图模型具有相同内存的同一对象

这是我的新测试和我的视图模型

ViewModel

public Command LoginCommand
{
get
{
return new Command(async () =>
{
if (!string.IsNullOrEmpty(Login) && !string.IsNullOrEmpty(Password))
{
var infos = new LoginRequest() { Username = Login, Password = Password };
LoginResponse response = await _userService.Login(infos);
Age = response.Age;
}
});
}
}

测试

private Mock<IUserService> _userService;
private MainPageViewModel _viewModel;
private Fixture _fixture;
[SetUp]
public void Setup()
{
using (var mock = AutoMock.GetLoose())
{
_userService = mock.Mock<IUserService>();
}
_fixture = new Fixture();
}
private MainPageViewModel CreateInstance()
{
return new MainPageViewModel(_userService.Object);
}
[Test]
public void Test_Constructor()
{
using (var mock = AutoMock.GetLoose())
{
var viewModel = mock.Create<MainPageViewModel>();
viewModel.Login.Equals("");
viewModel.Password.Equals("");
}
}
[Test]
public void Login_Success()
{
var user = _fixture.Create<LoginResponse>();
_viewModel = CreateInstance();
_viewModel.Login = "test";
_viewModel.Password = "test";
_userService
.Setup(s => s.Login(It.IsAny<LoginRequest>()))
.Returns(Task.FromResult(user))
.Verifiable();
_viewModel.LoginCommand.Execute(null);
_userService.Verify();
Assert.AreEqual(_viewModel.Age, user.Age);
}