Testing applications is important, as shows the rise of continuous integration and automated testing. In this talk, I will focus on one area of testing that is difficult to automate: poor network connectivity. Developers usually work within reliable networking conditions so they might not notice issues that arise in other networking conditions. I will explain how traffic control on Linux can help to simulate various network connectivity. I will run a demo with Weave Scope showing how an application running in Kubernetes behaves when changing network parameters.