Active distribution networks integrate controllable energy resources into new coordinated operational strategies based on distributed or centralised control schemes. Especially for new and innovative players in the field, laboratory testing serves to identify integration needs and reveals real-world technology issues that cannot be recognized in simulated environments. Industrial and certification laboratories address such needs for component-level tests, however, new types of facilities are required for systemlevel testing, accommodating the interactions of both physical and cyber-infrastructures. This paper reflects on case studies of recent integrated system experiments carried out in the integrated test facility SYSLAB. These cases are used to observe evidence for the evolving testing needs, and extended laboratory requirements are distilled.