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我想为此控制器编写单元测试。我的目标是检查文件是否保存到wwwroot/images文件夹中，我想通过将文件夹中的文件与Guid生成的imageNameToSave.

问题是 - 产生了两个不同Guid的。

public async Task<IActionResult> Create(CreateNewsViewModel model)
{
    var imageNameToSave = Guid.NewGuid() + ".jpg";

    var role = await this.newsService.CreateNewsAsync(model.CreatedOn, model.Title, model.Text, imageNameToSave);

    using (var ms = new MemoryStream())
    {
       model.Image.CopyTo(ms);
       var uploads = 
       Path.Combine(this.hostingEnvironment.WebRootPath, "images");
       var filePath = Path.Combine(uploads, imageNameToSave);
       using (var fileStream = new FileStream(filePath, FileMode.Create))
          {
           await model.Image.CopyToAsync(fileStream);
          }
     }

    return this.RedirectToAction("Index", "Home");
}

这是我到目前为止所做的。我的问题是我怎样才能得到相同的结果Guid并在测试后删除创建的文件？

    [TestMethod]
    public async Task Call_NewsServiceWithCorrectParams_OnPost()
    {
        // Arrange
        DateTime createdOn = DateTime.Now;
        string title = "Tony Stark dies in Avengers!";
        string text = "Tony had to sacrifice himself for the greater good in the battle with Tanos";
        string imageNameToSave = Guid.NewGuid() + ".jpg";

        var ms = new MemoryStream();
        var formFile = new FormFile(ms, 0, ms.Length, "name", imageNameToSave);

        var newsServiceMock = new Mock<INewsService>();

        var hostingEnvironmentMock = new Mock<IHostingEnvironment>();

        var currentDirectory = Directory.GetCurrentDirectory();
        var endIndex = currentDirectory.IndexOf(@"\MovieManagement\");
        var wwwrootFolderPath = "\\MovieManagement\\MovieManagement\\wwwroot";
        var path = Path.Combine(currentDirectory.Substring(0, endIndex) + wwwrootFolderPath);

        hostingEnvironmentMock.SetupGet(x => x.WebRootPath).Returns(path);
        var model = new NewsViewModel()
        {
            CreatedOn = createdOn,
            Title = title,
            Text = text,
            Image = imageNameToSave
        };

        newsServiceMock.Setup(ns => ns.CreateNewsAsync(createdOn, title, text, imageNameToSave)).ReturnsAsync(model);

        var createModel = new CreateNewsViewModel()
        {
            CreatedOn = createdOn,
            Title = title,
            Text = text,
            Image = formFile
        };

        var sut = new NewsManagementController(newsServiceMock.Object, hostingEnvironmentMock.Object);

        // Act
        var result = await sut.Create(createModel);

        // Assert
        newsServiceMock.Verify(x => x.CreateNewsAsync(createdOn, title,
                text, imageNameToSave), Times.Once);
    }
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