MCCS - new Multiplayer content

Hello everyone. I'm new here. Could you please provide more details about the purpose of map testing? What are the goals of this process? I have a multiplayer map, and I need to know which utility I should use to ensure that scripts can be used on the map specifically in multiplayer mode. And how can I check if they are working correctly? Why do some maps cause the map tester to crash (when I delete the map, the tester continues to work without interruption until it reaches a certain "problematic" map)? Sometimes, mods are found along with the maps, and sometimes PAK files are found. Which of these affect the other maps? Or do both affect them? Thank you.