如何在 ASP.NET Core 中使用 ILogger 进行单元测试 [英] How to unit test with ILogger in ASP.NET Core

问题描述

这是我的控制器:

public class BlogController : Controller
{
    private IDAO<Blog> _blogDAO;
    private readonly ILogger<BlogController> _logger;

    public BlogController(ILogger<BlogController> logger, IDAO<Blog> blogDAO)
    {
        this._blogDAO = blogDAO;
        this._logger = logger;
    }
    public IActionResult Index()
    {
        var blogs = this._blogDAO.GetMany();
        this._logger.LogInformation("Index page say hello", new object[0]);
        return View(blogs);
    }
}

如您所见，我有 2 个依赖项，一个 IDAO 和一个 ILogger

As you can see I have 2 dependencies, a IDAO and a ILogger

这是我的测试类，我使用 xUnit 进行测试，使用 Moq 创建模拟和存根，我可以轻松模拟 DAO，但是使用 ILogger 我不我不知道该怎么做，所以我只是通过 null 并在运行测试时注释掉登录控制器的调用.有没有办法测试但仍然以某种方式保留记录器?

And this is my test class, I use xUnit to test and Moq to create mock and stub, I can mock DAO easy, but with the ILogger I don't know what to do so I just pass null and comment out the call to log in controller when run test. Is there a way to test but still keep the logger somehow ?

public class BlogControllerTest
{
    [Fact]
    public void Index_ReturnAViewResult_WithAListOfBlog()
    {
        var mockRepo = new Mock<IDAO<Blog>>();
        mockRepo.Setup(repo => repo.GetMany(null)).Returns(GetListBlog());
        var controller = new BlogController(null,mockRepo.Object);

        var result = controller.Index();

        var viewResult = Assert.IsType<ViewResult>(result);
        var model = Assert.IsAssignableFrom<IEnumerable<Blog>>(viewResult.ViewData.Model);
        Assert.Equal(2, model.Count());
    }
}

推荐答案

只需模拟它以及任何其他依赖项:

Just mock it as well as any other dependency:

var mock = new Mock<ILogger<BlogController>>();
ILogger<BlogController> logger = mock.Object;

//or use this short equivalent 
logger = Mock.Of<ILogger<BlogController>>()

var controller = new BlogController(logger);

您可能需要安装 Microsoft.Extensions.Logging.Abstractions 包才能使用 ILogger.

You probably will need to install Microsoft.Extensions.Logging.Abstractions package to use ILogger<T>.

此外，您可以创建一个真正的记录器:

Moreover you can create a real logger:

var serviceProvider = new ServiceCollection()
    .AddLogging()
    .BuildServiceProvider();

var factory = serviceProvider.GetService<ILoggerFactory>();

var logger = factory.CreateLogger<BlogController>();

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