Have you ever wondered how to test a light switch? Can you imagine it being one of the biggest challenges in your career? There are nearly six billion IoT (Internet of Things) devices. By 2020, this number may triple. Undoubtedly, it is a rapidly developing area of IT market.I will take the participants for a journey to the IoT world. It will be a talk about the challenges that any tester will face at some point. I will present the dangers and snares but also good practices and practical approach to E2E test automation for the IoT solutions.The main question is: how to test application for end user among so much hardware equipment? Technical examples will be presented using Python languages and supported by physical devices.