使用System.IO.Abstractions.TestingHelpers验证对File.Delete的调用

问题描述

我使用System.IO.Abstractions.TestingHelpers来模拟FileSystem。在我的课堂上，我注入IFileSystem并使用该实例调用_fileSystem.File.Exists和_fileSystem.File.Delete。在测试类中，我想验证是否已调用“删除”方法。仅模拟IFile很容易，但是由于我已经模拟了FileSystem，所以我不想在其之上模拟目录，路径和文件。是否可以调用类似_fileRepository.FileMock.Verify(x => x.Delete(It.IsAny<string>())) ...的东西？

public class Downloader : IDownloader
{
    public Downloader(HttpClient httpClient,IFileSystem fileSystem) 
    {
        HttpClient = httpClient;
        FileSystem = fileSystem;
    }

    public async Task DownloadConfigFileAsync(string updatedConfigBaseFolderPath,string configurationFileUrl,string personalAccessToken)
    {
        var newFilePath = FileSystem.Path.Combine(updatedConfigBaseFolderPath,"subfolder1","myNewFile.txt");
        if (FileSystem.File.Exists(newFilePath))
        {
            FileSystem.File.Delete(newFilePath);
        }

        // rest of implementation ommited for demo purpose
    }
}

我的测试就像：

[Fact]
public async void Given_MissingPathParts_ShouldThrow()
{
    var handlerMock = GetMessageHandlerMock();
    var mockFileSystem = new MockFileSystem(new Dictionary<string,MockFileData>
    {
        { @"c:\Test\",new MockDirectoryData() },{ @"c:\Test\subfolder1\myNewFile.txt",new MockFileData(string.Empty) }
    });

    var httpClient = new HttpClient(handlerMock.Object);
    var sut = new Downloader(httpClient,mockFileSystem);

    await sut.DownloadConfigFileAsync(BasePath,"http://fakeurl.com?path=%2Fconfiguration%2Flocal%2FTestFile.txt",_fixture.Create<string>());

    handlerMock.Protected().Verify(
        "SendAsync",Times.Exactly(1),ItExpr.Is<HttpRequestMessage>(req => req.Method == HttpMethod.Get),ItExpr.IsAny<CancellationToken>());

    mockFileSystem.File.Exists(FilePath).Should().BeTrue();
    
   // Add assertion that the File.Delete has been called
}

解决方法

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moq unit-testing