单元测试 TelemetryProcessor 和 TelemetryInitializer（Application Insights）？

Question

我一直在网上寻找对我的处理器和初始化器进行单元测试的方法。到目前为止，我已经从另一篇文章中设置了以下代码，但我对如何继续操作有点迷茫。

public class TelemetryClientTests
{
    private TelemetryClient telemetryClient;
    private List<ITelemetry> sendItems;

    [TestInitialize]
    public void TestInit()
    {
        var httpContext = Substitute.For<IHttpContextAccessor>();
        var configuration = new TelemetryConfiguration();
        //this.sendItems = new List<ITelemetry>();
        configuration.TelemetryChannel = new RequeteTelemtry();
        configuration.InstrumentationKey = Guid.NewGuid().ToString();
        configuration.TelemetryInitializers.Add(new OperationCorrelationTelemetryInitializer());
        this.telemetryClient = new TelemetryClient(configuration);
    }

    /// <summary>
    /// Ensure that context being propagated via async/await.
    /// </summary>
    [TestMethod]
    public void ContextPropogatesThruAsyncAwait()
    {
        var task = this.TestAsync();
        task.Wait();
    }
}

我不确定应该在哪里添加 telemtryprocessor，以便 Application Inisight 知道我正在对其进行单元测试。如果有人知道怎么做，将不胜感激。

Answer 1

这是我们对遥测初始化程序进行单元测试的服务之一的示例。

首先，我们有 NullTelemetryProcessor。它有两个作用：防止数据实际发送到 Application Insights 服务；而是将所有项目存储在内存中（因此可以将它们用于断言）。

请注意，遥测处理器运行在遥测初始化器之后。

public class NullTelemetryProcessor : ITelemetryProcessor
{
    public List<ITelemetry> Items = new List<ITelemetry>();

    public void Process(ITelemetry item)
    {
        this.Items.Add(item);
    }
}

然后我们注册它：

[TestInitialize]
public void Initialize()
{
    // Initialization of a telemetry configuration
    this.telemetryConfiguration = new TelemetryConfiguration();

    // Adding a telemetry processor which prevents actually sending anything
    this.nullTelemetryProcessor = new NullTelemetryProcessor();
    TelemetryProcessorChainBuilder builder = this.telemetryConfiguration.TelemetryProcessorChainBuilder;
    builder.Use(next => this.nullTelemetryProcessor);
    builder.Build();
}

那么测试可能如下所示：

[TestMethod]
public void AppInsightsTelemetryClient_TrackException()
{
    // Act
    this.telemetryClient.TrackException(new Exception("myexception"));
    this.telemetryClient.Flush();

    // Assert
    Assert.AreEqual(1, this.nullTelemetryProcessor.Items.Count);
    ExceptionTelemetry telemetryItem = this.nullTelemetryProcessor.Items[0] as ExceptionTelemetry;
    Assert.IsNotNull(telemetryItem);
    Assert.IsNull(telemetryItem.Context?.Operation?.ParentId);
    Assert.IsNull(telemetryItem.Context?.Operation?.Id);
}

单元测试 TelemetryProcessor 和 TelemetryInitializer（Application Insights）？

Unit Testing TelemetryProcessor and TelemetryInitializer (Application Insights)?

unit-testing

azure-application-insights

open-telemetry