new_contents: import pytest
  import random
  from uuid import UUID
  from helusers.utils import uuid_to_username, username_to_uuid
  
  
  def test_uuid_to_username():
      assert uuid_to_username('00fbac99-0bab-5e66-8e84-2e567ea4d1f6') == 'u-ad52zgilvnpgnduefzlh5jgr6y'
  
  
  def test_username_to_uuid():
      assert username_to_uuid('u-ad52zgilvnpgnduefzlh5jgr6y') == UUID('00fbac99-0bab-5e66-8e84-2e567ea4d1f6')
  
  
  def test_reflective_username_uuid_relationship():
      rd = random.Random()
      rd.seed(0)
  
      for uuid in [UUID(int=rd.getrandbits(128)) for i in range(0,100)]:
          assert username_to_uuid(uuid_to_username(uuid)) == uuid
  
subject: Add some tests for helusers