An agent is the workhorse of the Tensei system. It uses an actor system to do the actual work of reading, parsing, transforming and writing the data. It communicates with the tensei-server which is responsible for starting and stopping and agent.
The current configuration and test setup uses EventFilter.debug in several places. As a result everything of level DEBUG or higher gets logged to standard output which results in a very large log (around 40MB!).
Try to replace the relevant sections to be able to have at least a loglevel of INFO which should reduce the test output significantly.
After the work in dfasdl-utils is done (see DFASDL/dfasdl-utils#7) the agent should be modified to use strong typing internally too which will eleminate the messy usage of Any and List[Any].
This is rather involved and will require touching a lot of code!