Using Application Insights with Unit Tests?

Question

I have an MVC web app, and I\'m using Simple Injector for DI. Almost all my code is covered by unit tests. However, now that I\'ve added some telemetry calls in some contr

Answer 1

Application Insights has an example of unit testing the TelemetryClient by mocking TelemetryChannel.

TelemetryChannel implements ITelemetryChannel so is pretty easy to mock and inject. In this example you can log messages, and then collect them later from Items for assertions.

public class MockTelemetryChannel : ITelemetryChannel
{
    public IList Items
    {
        get;
        private set;
    }

    ...

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

...

MockTelemetryChannel = new MockTelemetryChannel();

TelemetryConfiguration configuration = new TelemetryConfiguration
{
    TelemetryChannel = MockTelemetryChannel,
    InstrumentationKey = Guid.NewGuid().ToString()
};
configuration.TelemetryInitializers.Add(new OperationCorrelationTelemetryInitializer());

TelemetryClient telemetryClient = new TelemetryClient(configuration);

container.Register(telemetryClient);