Besides the main blockchain use-case of exchanging cryptocurrencies, Distributed Applications (DApps) can also be developed on top of such a technology. However, due to the size of popular blockchains and price, testing these DApps in a real-world environment becomes challenging. Thus, blockchain emulators were proposed to address such as issue. This paper presents the experience of emulating an Ethereum network using a Docker-based lightweight testbed developed for Software Defined Networks (SDN).