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Performance test your ASP.NET Core application using NBomber

Yesterday I talked about Bombardier, an HTTP benchmarking tool written in Go and how you can use it to test the performance of your ASP.NET Core applications. While discussing the usage, a colleague mentioned another load testing tool, NBomber.

NBomber is a load-testing framework for Pull and Push scenarios, designed to test any system regardless of a protocol (HTTP/WebSockets/AMQP, etc) or a semantic model (Pull/Push).

It goes a lot further than what Bombardier has to offer. One of the things I find nice is that load test scenario’s can be written using C#. 😉

Remark: NBomber comes with a free personal license, if you want to use it inside your organization, you’ll have to buy a business license.

Let’s write a simple load test to test our API!

  • We start by creating a new Console application and adding the NBomber nuget package:
    • dotnet add package NBomber
  • As we want to test an HTTP endpoint, let’s also add the NBomber.Http plugin to simplify defining and handling of HTTP load tests:
    • dotnet add package NBomber.Http
  • Now we can start writing our test scenario. Here is a simple example scenario where we call our API endpoint simulating 100 users:


    • To run the scenario, we only have to run the console app:
    • After test completion results, results are written in multiple formats to a folder.
    • Here is how the HTML report looks like after the test run;


      Want to learn more? Check out this video introduction:

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