I need to define set of variables and they shuldn't be mixed with environment variables. At the begining of collection set I define them
pm.globals.set('a', 1);
and clear it athe the end ot tests set
pm.globals.clear();
It works if I have consecutive set of tests. I need something like postman "collection pre-request script", but it is executed before every test. How to set some variables once before collection or folder execution?
If you'd like to set variables at the collection level then you can define those through the collection settings: https://learning.getpostman.com/docs/postman/environments_and_globals/variables/#defining-collection-variables
If you want to run the same pre-request script for every request in a collection (or folder), that can be done from the collection/folder settings too: https://learning.getpostman.com/docs/postman/scripts/pre_request_scripts/#adding-a-pre-request-script-to-a-collection-or-folder
