c# - Azure 函数的模拟 BlobClient

Question

我有一个具有 Blob 触发器的 Azure 函数，在我的函数方法参数中，我通过 BlobClient 公开 Blob 本身以及上传​​的文件的名称。

[FunctionName("MyFunc")]
public async Task RunAsync([BlobTrigger("upload/{name}", Connection = "DataLake")]
                            BlobClient blob, string name)
{
    var propertiesResponse = await blob.GetPropertiesAsync();
    var properties = propertiesResponse.Value;
    var metadata = properties.Metadata;

    //do stuff with metadata
                
    if (metadata.TryGetValue("activityId", out var activityId))
    {

    }

    using (var stream = await blob.OpenReadAsync())
    using (var sr = new StreamReader(stream))
    {
        //do some stuff with blob
    }
}

我想对该函数进行单元测试，并尝试模拟 BlobClient，但在使用 Moq 库时遇到问题。我找到了BlobsModelFactory旨在帮助模拟，但我看不到 BlobClient 的任何内容。有人设法模拟 BlobClient 吗？

Answer 1

符合新的Azure SDK guidelines公共(public)方法被标记为virtual，因此可以模拟它们:

A service client is the main entry point for developers in an Azure SDK library. Because a client type implements most of the “live” logic that communicates with an Azure service, it’s important to be able to create an instance of a client that behaves as expected without making any network calls.

1. Each of the Azure SDK clients follows mocking guidelines that allow their behavior to be overridden:
2. Each client offers at least one protected constructor to allow inheritance for testing.All public client members are virtual to allow overriding.

如果是 BlobClient 模拟，可以像这样完成*:

var mock = new Mock<BlobClient>();
    var responseMock = new Mock<Response>();
    mock
        .Setup(m => m.GetPropertiesAsync(null, CancellationToken.None).Result)
        .Returns(Response.FromValue<BlobProperties>(new BlobProperties(), responseMock.Object))

很多东西，比如 BlobProperties，都可以使用静态类 BlobsModelFactory 来模拟。 ，一些例子:

var blobProps = BlobsModelFactory.BlobProperties(blobType: BlobType.Block);
var result = BlobsModelFactory.BlobDownloadResult(content: null);

其他引用资料:

• https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/core/Azure.Core/README.md#mocking
• https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/core/Azure.Core/samples/Mocking.md

*代码仅用于演示，引用资料提供了如何使用 BlobsModelFactory 的线索