Software testing is one of the most complex and less understood areas of software engineering. When creating software, the testing process commonly accounts for the highest fraction of costs, efforts and time-to-market of the whole software development lifecycle. This demonstration shows how to cope with the emergence of highly distributed and interconnected heterogeneous environments (i.e. the new MEC with ubiquitous support paradigm). It shows appropriate testing of the end-to-end Open5Gcore Core Network without becoming prohibitive for software and service providers.