The automated well testing trailer is a fully automated mobile well testing platform for both onshore and offshore operations. Featuring metal-to-metal (MTM) process line connections, the trailer has many applications, including high-H2S environments. It integrates a well control module and a well test separator that can be used together or as stand-alone units. The automated well testing trailer also reduces fugitive emissions by using human-independent metering and choke adjustments. Remote monitoring and control reduces manual intervention and lowers HSE risk.