open-telemetry / opentelemetry-dotnet

Testing - open-telemetry/opentelemetry-dotnet

Testing is an essential part of any software development project, and OpenTelemetry .NET is no exception. This section will discuss the available testing strategies and options for the OpenTelemetry .NET project, which can be found at https://github.com/open-telemetry/opentelemetry-dotnet/.

Unit Testing

Unit testing is a software development process in which the smallest testable parts of an application, called units, are individually and independently tested for correct functionality. In OpenTelemetry .NET, unit tests can be written using popular testing frameworks such as MSTest, xUnit, and NUnit.

Here’s an example of a unit test for the OpenTelemetry .NET project using xUnit:

[Fact]
public void TestTracerProvider()
{
var tracerProvider = Sdk.CreateTracerProviderBuilder()
.AddSource("MyTestSource")
.Build();

using (var tracer = tracerProvider.GetTracer("MyTestTracer"))
{
var span = tracer.StartSpan("MyTestSpan");
span.Dispose();
}
}

(Source: https://opentelemetry.io/docs/instrumentation/net/manual/)

Integration Testing

Integration testing is a type of software testing that focuses on multiple components or systems working together to produce the expected outcome. In OpenTelemetry .NET, integration tests can be written to test the interaction between different components of the OpenTelemetry .NET project.

Here’s an example of an integration test for the OpenTelemetry .NET project:

[Fact]
public void TestExporter()
{
var exporter = new ConsoleExporter();
var tracerProvider = Sdk.CreateTracerProviderBuilder()
.AddSpanProcessor(new BatchSpanProcessor(exporter))
.Build();

using (var tracer = tracerProvider.GetTracer("MyTestTracer"))
{
var span = tracer.StartSpan("MyTestSpan");
span.Dispose();
}

// Assert that the span was exported to the console exporter
// ...
}

(Source: https://opentelemetry.io/docs/instrumentation/net/manual/)

End-to-End Testing

End-to-end testing is a software testing methodology that tests the complete system flow from beginning to end. In OpenTelemetry .NET, end-to-end tests can be written to test the entire OpenTelemetry pipeline, including data collection, processing, and exporting.

Here’s an example of an end-to-end test for the OpenTelemetry .NET project:

[Fact]
public void TestEndToEnd()
{
// Set up the OpenTelemetry pipeline
// ...

// Generate some telemetry data
// ...

// Assert that the telemetry data was correctly processed and exported
// ...
}

(Source: https://opentelemetry.io/docs/instrumentation/net/getting-started/)

Troubleshooting

If you encounter any issues while testing the OpenTelemetry .NET project, you can use the following troubleshooting steps:

  1. Enable detailed logging by setting the OTEL_LOG_LEVEL environment variable to debug before the instrumented process starts.
  2. Check the otelcol_receiver_accepted_spans and otelcol_receiver_refused_spans metrics to ensure that the data points have been received by the Collector.
  3. Refer to the OpenTelemetry .NET documentation for general troubleshooting steps and solutions to specific issues.

(Source: https://opentelemetry.io/docs/instrumentation/net/automatic/troubleshooting/)

In conclusion, OpenTelemetry .NET provides several testing options, including unit testing, integration testing, and end-to-end testing. By following the examples and documentation provided, you can ensure that your OpenTelemetry .NET project is thoroughly tested and functioning correctly.