How to test kubernetes?

We need to test and demonstrate Kubernetes, but we have not our own’s micro services application, Is there any suggested open source application(like in GitHub) for us to demonstrated and tested in Kubernetes? Any test suggestions about it? Thanks in advance!

There are two demo micro-services examples I usually use:

This is used on the kubernetes up and running book

https://github.com/kubernetes-up-and-running/kuard