You will probably want to test your processors in isolation when developing them, as this will be quicker in most all cases. Here's how:
.devenv
LOCAL_ENV_ID=dev
DATABASE_ID=drupal
COMMAND=pull
IS_WRITEABLE_ENVIRONMENT=true
ldp process delete_users.sh --env=.devenv
process command with the processor basename as the argument and the path to the dotenv file you created.